Tuesday, May 6, 2008

ISA HK/China --- Visit of ISA Directors on May 1 - 3, 2008


*** Our weekly Station Mail is for the information of Station Members only, but Station Mail has given up copyright & can be freely circulated. For administrative reasons, comments from outsiders are usually not entertained & may be circulated within our system locally & overseas. Please note Station Mail is sometimes given in Blog at http://isahkchina.blogspot.com , although images are usually not attached due to size. ***

Dear Station Members,

The visit by ISA Certification Director Mr. Derek Vannice, ISA Membership Director Mr. Eric Duchinsky & ISA Certification Board Member Mr. David Glenn from May 1 - 3, 2008 to ISA HK/China has been like whirlwind. During their 3 days of stay, a meeting with CA family Members, a CA exam, a CTW Evaluator Training, a CTW exam & an Informal Dinner held in their honour have taken place. Anyone can imagine how busy their schedules were in HK for the benefit of ISA development in our region.

Summarizing their visit, there are two major points of discussion that ISA HK/China would like to put forward to our Station Members for public participation:

1. Setting up a Board of Directors in ISA HK/China

As all Station Members have known for years, ISA HK/China did not have much of a staff structure & the Station Manager has been Jack of All Trades in the Station. This may work when our Station is small, but as we expand (+620 Station Members by now & growing), we need to consider better organization.

Discussion has taken place among CA Family Members with ISA Directors on how to formalize a proper structure in ISA HK/China, e.g. with President, Board Members, Committees, etc. so that workload can be shared & positive progress can be made. A time span of 1 year was proposed to set up this structure. However, no conclusion has been reached on how to bring in Board Members, such as by election with an Annual General Meeting or by nomination from Station Manager to be approved by public voting. Each has its own merits & careful consideration will take place within the next 12 months to agree on a strategy.

It is paramount in our future structure that SIA HK/China can maintain its present course of promoting tree care by research & education only, & not turned into an Activist Group or an attachment to any political or religious party. It has been agreed with ISA Directors that Station Membership like it is now, will not be publicly disclosed no matter how the future structure will become, to be in line with the open promise to anyone joining ISA HK/China that Station Membership will be guarded by the Station Manager alone. Successive Station Manager will hold Station Membership & this person must continue to safeguard Station Membership as an oath. On the other hand, anyone communicating with future staff of ISA HK/China will naturally link up with that particular channel in a natural way & be known.

Even in the meeting with ISA Directors on May 1, Station Membership was not disclosed by names, but only by categories. No one's personal information has so far been leaked.

Therefore, ISA HK/China now is keen to look for suitable candidates to fill our future posts, no matter how they may turn out to be. We are looking for personnel who can keenly participate into our activities & development, & not someone collecting title & sit back. This has been the ISA tradition. ISA HK/China will follow the 84 years of ISA history in forming our future structure, & will refer to the laws & constitution of ISA for our own development.

2. Future ISA Exams

People in our territory appear to love exams & credentials, partly out of tradition & partly out of habit. ISA HK/China will do our best to accommodate that.

We are now looking at ways to increase our CA exam from 2 regular one to perhaps 3 this year. For CTW exam, we are hoping to increase from the present 2 to 4 in a year, & increase the number of intake every time. In doing this, we shall need more Proctors & Evaluators. As certification runs independently from Station administration, the Chief Proctor in our territory is setting a very high standard to recruit our Proctors & Evaluators. We shall need someone actively participating in our activities as a priority, rather than someone with merely academic qualification or social influence. Our Proctors & Evaluators must also demonstrate a higher standard of Integrity & good Moral to maintain exam security & independence at all times. The Chief Proctor will be responsible to select these good men & women in our territory, before passing them over to ISA HQ for final approval.


ISA Directors have been generally satisfied with the development of ISA HK/China in the past 3 years. ISA HK/China is also constantly evolving & advancing to gradual recognition in our Govt & public sectors. In our development, ISA HK/China wishes to remember the words of our HK Senior Mr. Li Ka Shing that we should " maintain stability in our development, & maintain development in our stability". This appears to be the correct path to go.

Wise men have gone through our track & can advise. Then should we not listen?

best regards,

Sammy Au
Station Manager

The ISA Mission - Through research, technology, and education, promote the professional practice of arboriculture and foster a greater public awareness of the benefits of trees. (http://www.isa-arbor.com/)

Friday, May 2, 2008

ISA HK/China --- Absence of Sammy Au in HK from May 9 - 15, 2008

Dear Station Members,

Please kindly note that the Station Manager Mr. Sammy Au will be absent in HK from May 9 - 15, 2008 inclusive to attend the ISA Asia Pacific Arboricultural Conference in Brisbane, Australia. If there is anything required of him during this period, please either e-mail him at egc@netvigator.com , or try to call him at + 61 - 43 - 252 - 7206 if this number still works in Australia. Please note Brisbane is 2 hours ahead of HK if anyone calls.

Alternatively, you may wish to contact the Station Manager in HK away from the above-mentioned period for any enquiry.

Thank you for your kind attention.

best regards,

Sammy Au
Station Manager
ISA HK/China http://isahkchina.blogspot.com

Thursday, May 1, 2008

ISA HK/China --- CUGE research online

Dear Station Members,

It is the pleasure of ISA HK/China to inform you that we are now able to access online with CUGE of Singapore to share their research in greenery with their abundant resources. We are indeed grateful to our Singaporean counterparts for providing us this wonderful opportunity to learn about their development which is relevant & guiding for greenery in our territory.

Please kindly follow the link as described below to retrieve the information, & be thankful to CUGE while you are there.

best regards,

Sammy Au
Station Manager


----- Original Message -----
From: Angelia SIA
To: Undisclosed Recipients
Cc: Puay Yok TAN
Sent: Monday, April 28, 2008 5:25 PM
Subject: CUGE Research's Urban Greenery Bibliography Database Now Available Online

(Embedded image moved to file: pic22679.jpg)

Dear Partners,

Thank you for your support to CUGE Research. Since our formation on 1stApril 08, we have received enquiries from some of you. We have also metsome of you to discuss joint research possibilities.It is with pleasure we announce that resources like our newsletters, Xylem and INSIGHT and handbooks like "A Selection of Plants for Green Roofs inSingapore" are now available for downloading at this link,http://www.cugeresearch.com/ under www.cuge.com.sg.

Besides publications, we have also implemented an Urban GreeneryBibliography Database, which consolidates some literature which we havecome across in the areas of Urban Landscape Management, Urban Ecology,Forms of Urban Greenery and Socio-Economics research.

We hope you will thisuseful.Thank you.

Best Regards,

Angelia Sia § Manager (CUGE Research)
§ National Parks Board § Tel: +6564717831 § Fax: +65 64723033Privileged/Confidential information may be contained in this message. Ifyou are not the intended recipient, you must not copy, distribute or use itfor any purpose, nor disclose its contents to any other person. Pleasenotify the sender immediately if you receive this in error.Check out our website at http://www.nparks.gov.sg http://www.cuge.com.sg

Tuesday, April 29, 2008

ISA HK/China --- Reply to Lo Tung's enquiry on Tree Transplantation

*** Our weekly Station Mail is for the information of Station Members only, but Station Mail has given up copyright & can be freely circulated. For administrative reasons, comments from outsiders are usually not entertained & may be circulated within our system locally & overseas. Please note Station Mail is sometimes given in Blog at http://isahkchina.blogspot.com , although images are usually not attached due to size. ***

Dear Mr. Lo,

Thank you for your patience for us to draft a reply on your enquiry on Tree Transplantation. Please note that we are giving the reply on technical ground only, without bias nor sentiment, from our professional knowledge as Practising Arborist. ISA HK/China is a research & education organization & we do not become involved with politics. Hence our reply will follow only our guided principles of Integrity, Professionalism, Participation, Fact-finding & Truth-telling, as we always should.

In any recommendation for Tree Transplantation, an Arborist would first study into two major areas: Survival after transplantation & Practicality of the transplanting work.

For Survival consideration, we would review the health & structure of a tree to determine whether it would be worthwhile to carry out the transplant. The guiding principle would be that what good is it to transplant a tree if it would not survive the transplant, or it may pose as a potential hazard to the public after the transplant. An Arborist would have various skills & methods to determine such requirement & it would take several days of lectures to tell you all this, rather than in a simple e-mail reply.

For Practicality of the transplant, we would usually require to lift a rootball of a size of 10 x trunk diameter to conform to the international requirement in tree transplantation. Therefore, a 2 ft trunk diameter tree would require a rootball of 20 ft in diameter, & so on. On the other hand, you are correct in pointing out that most lorries in HK can not accommodate oversized rootballs. The average width of a HK lorry is usually around 8 ft only. This would mean an acceptable rootball to sit on any lorry would be around 8 ft in diameter, giving the maximum trunk size of a tree to be transplanted to be about 10 inches in diameter. For any tree larger than that, the rootball will have to be cut off, leading to future death or poor growth as seen after many tree transplantation in HK.

Taking the lorry width of 8 ft into consideration, this would also limit the canopy width of any tree to be carried. A tree of 10 inch rootball would usually carry a canopy of natural width well over 20 ft in diameter. This would mean the tree canopy would need to be chopped down to 8 ft in order to fit. Any tree chopped, or better be called 'topped' , would usually lead to future decay at wounds. Decay is a tree is not known internationally to be stopped by chemicals or by cultural treatment. This tree may eventually become a potential hazard to fail in the wind.

Above are the simplified answer to your enquiry from our professional knowledge. Arborists are Tree Doctors & Tree Detectives. We are the specialists in tree care. If you would need more information on this topic, we would recommend you to visit International Society of Arboriculture (ISA at www.isa-arbor.com), or to consult any Practising Arborist for a more detailed answer. ISA was set up in 1924, & is the largest & oldest tree care organization in the world. Arborists are also friendly Practitioners & we are always ready to help. You can also find out more about ISA HK/China at http://isahkchina.blogspot.com in our territory of HK, Macau, Taiwan & China.

Thank you for your enquiry & please do not hesitate to approach us for further questions.

Please kindly note that we are forwarding this message on our Station Mail system for the information & knowledge of our Station Members.

best regards,

Sammy Au
ISA HK/China Station Manager
Practising Arborist, Professional Nurseryman & Landscaper

The ISA Mission - Through research, technology, and education, promote the professional practice of arboriculture and foster a greater public awareness of the benefits of trees. (www.isa-arbor.com)



----- Original Message -----
From: Lo Tung Lo
To: btang@aud.gov.hk ; dlcsoffice@lcsd.gov.hk ; ayscheung@lcsd.gov.hk ; wingsleung@lcsd.gov.hk ; mailbox@afcd.gov.hk ; cary_ph_ho@afcd.gov.hk ; yk_chan@afcd.gov.hk ; pk_chan@afcd.gov.hk ; landsd@landsd.gov.hk ; ddg@landsd.gov.hk ; ceshq@landsd.gov.hk ; cswai@hyd.gov.hk ; sla3.lu@hyd.gov.hk ; sla1.lu@hyd.gov.hk ; sla2.lu@hyd.gov.hk ; yuech@archsd.gov.hk ; ault@archsd.gov.hk ; wongv@archsd.gov.hk ; lewisah@archsd.gov.hk ; pi@legco.gov.hk ; rctho@capitalchina.com ; contact@alanleong.net ; info@liwahming.org.hk ; selina@selinachow.com ; jkstolegco@gmail.com ; yuenhan@ftulegco.org.hk ; bernie@bernardchan.com ; kamlamchan2004@yahoo.com.hk ; cksin@sinchungkai.org.hk ; az3286pw@netvigator.com ; jet@dab.org.hk ; howardyoung_legco@yahoo.com.hk ; kwlau@dab.org.hk ; miriamlau@liberal.org.hk ; elau@frontier.org.hk ; sychoy@pacific.net.hk ; chengkarfoo@dphk.org ; ttfok@netvigator.com ; arazack@netvigator.com ; albert.wychan@yahoo.com.hk ; kwaifong56@yahoo.com.hk ; kyli@dab.org.hk ; kkk@kkkwok.org ; hokming@ntas.org ; patricklau@gmail.com ; contactus@mandytam.com
Cc: lotunglo@yahoo.com.hk ; cahk@cahk.org.hk ; info@greensense.org.hk ; egc@netvigator.com ; secretary@hkila.com
Sent: Saturday, April 26, 2008 7:10 PM
Subject: 是保育樹木,還是浪費公帑?


是保育樹木,還是浪費公帑?
(圖一)

這棵樣子奇怪的樹是攝於馬鞍山的一個政府樹木移植接收場,它是眾多受不同建築工程影響而被移植的樹木之一。政府每年耗費大量人力物力去保護受發展影響的樹木,跟據發展局技術指引ETWB TC No. 3/2006規定,負責工程項目的部門必須盡力保護工地上原有的樹木,所有樹木必須被紀錄並由有關的部門對其最終的處理方法(原地保留、移植或砍除)進行審批。政策方向完全正確及對環境負責,但實際運作如何?政府部門如何審批處理受工程影響的樹木?究竟圖中的這棵樹為甚麼這樣奇怪?

圖中的樹是細葉榕(Ficus microcarpa 一般稱為榕樹),未被移植之前是甚麼樣子我們無法肯定,但跟據榕樹正常的生長形態我們其中一個推斷是,原來的樹要比圖中的大得多。移植後主幹已失,剩下來的其實是一條氣根和一節「斷肢」,樹木原來的樣子簡單推斷如下:
(圖二)

從保護樹木的角度考慮,市民肯定不是要使用大量金錢而去製造這件「藝術品」,也不會認同這種「偽保育」。市民希望知道的是原來的樹幹去了哪裡?這裡衍生了更多的問題。
問題
原來的樹為甚麼不被移植過來?
這種情況是否常見?
是否承建商的責任?

這些問題可以從其它移植樹木的情況得到答案:
         
(圖三)

從以上各張圖片所見,奇形怪狀的樹木並非個別例子,亦非由單一個工程所造成。縱使品種不同,這些被移植的樹木都有一個共同特徵──斬首斬腳(斷肢)。

驟眼看來,移植樹木的承建商似乎需要為其錯誤的修剪技術及施工程序負全責。事實上本港的樹藝工程仍處於很低的技術水平;但圖片中的樹木還有一個共通點──被修剪過的大樹尺寸(總高與寬)似乎相近。其實這是反映了一件不爭的事實,在運輸樹木的過程中必須要乎合交通條例,例如對負載貨物(樹木)的要求。我們因此對上文那棵樹何以變成斷枝的原由可以有個初步的結論。

承建商一般只是根據合約及條例去施工,因此以這種大樹的移植工程來看,造成這種惹人詬病之情況的責任不可以完全歸究承建商,反而是牽頭的工程部門,更或是審批移植或要求要把大樹移植的部門。這是否涉及政府部門的行政失當或決策錯誤?

問題

是甚麼政府部門去審批有關樹木的保育事宜?

跟據發展局技術指引ETWB TC No. 3/2006第17條,任何政府土地上的樹木皆不可以被無故砍伐。發展必須首先考慮原地保留樹木,情況不許可時應考慮移植(除非該樹木的保育價值為低、移植後的存活率低或移植後將無法復原至正常之樹形),最後才考慮砍除。技術指引還清楚表明有關的考慮必須平衡成本及效益。指引內容清晰且合情理,對自然保育越來越關注的市民大眾來說,既為保育把了關,同時亦確保公帑不被浪費。

可是,到了執行層面,則是另一個景象!現時處理樹木事宜的部門五花八門,並非統一處理。但簡單來說,負責審批砍樹移樹或提供竟見的部門主要有四個:地政署、康文署、漁護署及路政署。地政署負責最後審批的步驟,因該部門並無樹木專家,審批前必先諮詢康文署、漁護署或路政署的意見。康文署負責已批出土地的樹木前宜,因此是最關鍵的部門,其意見及決定直接影響絕大多數公務發展項目。

政府部門是否有根據發展局技術指引的精神處理樹木事宜?且看移植樹木的品種、結構和樹形可知一二:
   
(圖四)
   
(圖五)

從圖四中可見,被移植樹木的品種包括本港非常常見的品種,而最令人感詑異的,是當中竟有些是有極高自行散播能力的品種──即等同於野草──典型的例子有血桐(Macaranga tanarius)及台灣相思(Acacia confusa)。另一點必須注意的是,有些外來品種(如台灣相思)本來就是廉價而生長極快的品種(故常大量使用於植林),由幼苗(成本約為港幣10元)起計只要少於十年時間便能成大樹;因此,政府動輒花費上數百倍價錢去移植一棵這樣的樹種是否合理?

樹木的價值當然並非全由成本效益去計算,比如市民的集體回憶、樹木的特別外形或該樹的歷史意義;但當出現大量這類極其普通的品種(以馬鞍山的那個樹木移植接收場計血桐已有25棵),而(以普遍的審美眼光為標準)大部份樹形皆非常平庸、甚至是差劣時(參考圖五),問題就相當明顯!

公帑花了,目的是否達到了?

問題

被移植的樹木是否真的能存活?
被移植的樹木是否安全?
移植樹木是否等於環境保謢或自然保育?

暫且勿論美感及價值,市民也希望知道被移植後的樹木「下場」如何。其實在沒有足夠的技術條件或空間下,強行移植大型樹木的失敗率極高。要是樹木生長於石面、斜坡及起吊困難的地方、或是受交通運輸所限制,移植時所能保留的根系也必然不足以支持移植後的復完及生長,最終樹木會慢慢轉弱,最後死亡。再以本文開始的榕樹為例,該樹原來樣子的另一個可能性是:
(圖六)

若樹木原本是生長在這樣的地勢,其根系很可能是攀附在岩石、石屎噴漿或極淺的表土上,強行移植後樹木的成活率不但極低,未能被完整保留的根系更會使被移植的樹木出現結構問題,隨時倒下,最終對市民構成危險。事實上,為了達到政府部門的「保育」目的,近年不少樹木就是在這樣不可行的情況下被移植。圖片的那棵榕樹很可能就是在這樣的情況下被「勉強保留」了下來(若非榕樹生有氣根,這種取巧的方法則根本不可行)。

無論是因為運輸上的限制(圖二)或是因為地勢的困難(圖六),「強行」移植樹木除了浪費金錢外,亦根本不能保育原來的樹木!至於搬移保育價值低的外來品種/入侵性強的品種,更加是與「保育」理念大相逕庭。政府花費大量的公帑進行這類「形式上」的花招,數字上可能達到了「全保育」、「零斬樹」,但實際上是只看數字、不專業、不科學、本末倒置的昏庸決定,既違背了發展局技術指引的精神,亦是欺騙公眾!

問題

移植樹木有無一個專業準則?有關的政府部門的知識水平是否足夠?
甚麼人需要為此等行政失當負責?
其他引申問題。

現時處理樹木事宜的工作分散至近十個政府部門,當中是否都有植物專家或合格的樹藝師是一個疑問。牽涉審批工程的地政署、給予「專業意見」的康文署及漁護署對評審斬樹、移樹的決定是否客觀、還是有其他政治考慮?最後,主導政府工程審批的還不可忽略一個有絕對決定性的架構──立法會工務小組委員會(PWSC)。工務小組委員會決定各項工程的撥款,政府部門會否受到任何政治壓力而作出一些數字上的包裝,以達到撥款的目的?參與工務小組的立法會議員又是否知道政府部門這些不當的施政?還是造就這些「走火入魔」的施政?

為了非必要的移樹工作,各工程在設計上,施工上又擔誤了多少時間?浪費了多少人力、物力?又有多少大樹理應原地保留,但在「以為移植可行」的情況下而不幸犧牲?


聲明

本文絕對支持樹木的保育,並認為樹木移植必須由專業人士在客觀的情況下審批,及在完善的監督下進行。本文無意針對任何工程、部門、人物,其旨在點出政府在處理樹木保育事宜上的不客觀、不合理、本末倒置,以及帶出這些施政所涉及的公帑浪費。期望有關部門、架構能在輿論的壓力下作出改善,撥亂返正。


發信人:Lo Tung
電郵: lotunglo@yahoo.com.hk

此文件致:

審計署 署長 鄧國斌先生 btang@aud.gov.hk

康樂文化事務署 署長 周達明先生 dlcsoffice@lcsd.gov.hk
康樂文化事務署 康樂事務經理(樹木及園景)香港 張裕生先生 ayscheung@lcsd.gov.hk
康樂文化事務署 康樂事務經理(樹木及園景)九龍 梁永生先生 wingsleung@lcsd.gov.hk

漁農自然保理署 署長 mailbox@afcd.gov.hk
漁農自然保理署 高級自然護理主任(南)  何秉皓先生 cary_ph_ho@afcd.gov.hk
漁農自然保理署 高級自然護理主任(北) 陳耀強先生 yk_chan@afcd.gov.hk
漁農自然保理署 高級自然護理主任(中區) 陳炳光先生 pk_chan@afcd.gov.hk

地政總署 署長 譚贛蘭女士 landsd@landsd.gov.hk
地政總署 地政總署副署長(一般事務)(地政處總部)  梁玉書先生 ddg@landsd.gov.hk
地政總署 總產業測量師(地政處/總部)  陳永堅先生 ceshq@landsd.gov.hk

路政署 署長 韋志成先生 cswai@hyd.gov.hk
路政署 高級園境師3  張美馨女士  sla3.lu@hyd.gov.hk
路政署 高級園境師1  梁錦鴻先生   sla1.lu@hyd.gov.hk
路政署 高級園境師2  郭德泰先生   sla2.lu@hyd.gov.hk

建築署 署長 余熾鏗先生 yuech@archsd.gov.hk
建築署 高級園境師/4 區李婷女士 ault@archsd.gov.hk
建築署 高級園境師/2 黃秋雲女士 wongv@archsd.gov.hk
建築署 高級園境師/3 盧偉思先生  lewisah@archsd.gov.hk

立法會工務小組委員會-

秘書: 馬海櫻女士 pi@legco.gov.hk
委員: 何鍾泰議員rctho@capitalchina.com、 梁家傑議員contact@alanleong.net
李華明議員info@liwahming.org.hk、 周梁淑怡議員selina@selinachow.com
涂謹申議員jkstolegco@gmail.com、 陳婉嫻議員yuenhan@ftulegco.org.hk
陳智思議員bernie@bernardchan.com、 陳鑑林議員kamlamchan2004@yahoo.com.hk
單仲偕議員cksin@sinchungkai.org.hk、 黃宜弘議員az3286pw@netvigator.com
曾鈺成議員jet@dab.org.hk、 楊孝華議員howardyoung_legco@yahoo.com.hk
劉江華議員kwlau@dab.org.hk、 劉皇發議員 c/o 委員會秘書、
劉健儀議員miriamlau@liberal.org.hk、 劉慧卿議員elau@frontier.org.hk
蔡素玉議員sychoy@pacific.net.hk、 鄭家富議員chengkarfoo@dphk.org
霍震霆議員ttfok@netvigator.com、 石禮謙議員arazack@netvigator.com
陳偉業議員albert.wychan@yahoo.com.hk、李永達議員kwaifong56@yahoo.com.hk
李國英議員kyli@dab.org.hk、 林偉強議員 c/o 委員會秘書、
郭家麒議員kkk@kkkwok.org、 張學明議員hokming@ntas.org
劉秀成議員patricklau@gmail.com、 譚香文議員contactus@mandytam.com

副本送:

長春社 蘇國賢先生 cahk@cahk.org.hk
環保觸覺 info@greensense.org.hk
國際樹藝學會香港分部 egc@netvigator.com
香港園境師學會 secretary@hkila.com
各園境顧問公司 c/o 香港園境師學會

亞洲電視新聞部 news@atv.com.hk
無綫電視新聞部 news@tvb.com.hk
有線電視新聞部 story@cabletv.com.hk
香港電台 cnews@rthk.org.hk
蘋果日報 news@appledaily.com
太陽報 news@the-sun.com.hk
東方日報 news@oriental.com.hk
星島日報 info@singtao.com
明報 inews@mingpao.com
成報 dailynews@singpao.com.hk
文匯報 editor@wenweipo.com
大公報 dgw_editor@163.com
SCMP quinton.chan@scmp.com
The Standard editor@thestandard.com.hk
AM730 chiefeditor@am730.com.hk
頭條日報 editorial@hkheadline.com
都市日報 news@metrohk.com.hk

Monday, April 28, 2008

ISA HK/China --- ISAAC e-news (Speakers Preview of the 2008 Brisbane ISA Conference)

Dear Station Members,

Underneath is the latest ISA Australia Chapter (ISAAC) e-news given to our region. Inside is a special preview on the Speakers of the May 8 Brisbane ISA Conference at which ISA HK/China will send in a group of no less than 13 participants (8 tree climbers to compete or support at the ATCC, & another 5 persons reported of going to ISA HK/China. No news has been received of which of our Govt Depts is going, although some said they may attend ...).

All ISA Conferences by tradition are serious education & networking known in ISA history of 84 years. In them, the latest research & practices are discussed & information from different regions is exchanged. Arborists are practitioners & talking with fantasy will not please most of them. They want to see things working with objectives attained, & not just talk, talk & talk. This is the attitude that makes Arborists such a distinctive profession accepted in the greenery industry around the world.

The Brisbane Conference will focus on knowledge relevant to our region such as tree inspection, tree pathology, risk assessment & tree failures which our region is aiming to improve. ISA HK/China hopes to bring back updates to educate our professionals so that our trees can become assets to our community rather than liabilities. Further announcement on this may be given later on.

ISA HK/China looks forward to participate & learn hard at the Brisbane Conference in about one week's time.

best regards,

Sammy Au
Station Manager



----- Original Message -----

From: ISAAC E-news

To: enews@isaac.org.au

Sent: Sunday, April 27, 2008 4:15 PM

Subject: ISAAC Enews #39 - ISA Asia Pacific Conference - SPEAKER PREVIEW

Visit the ISAAC Website http://isaac.org.au - Now with live tree news from around Australia!If you're not a member of the ISAAC E-news mailing list, you can join it at http://isaac.org.au/news/news.htm. It's free and you don't have to be a member of ISAAC.

****** ISA Asia Pacific Conference FILLING FAST ******

ISA Asia Pacific Conference - May 9-14, Brisbane, Australia. Interest is strong and more workshops and hotels are booked out. You will regret missing this once-in-a-lifetime opportunity to see this diverse range of speakers. See below for a sample of speaker biographies and abstracts.Register online at the ISAAC Online Shop to avoid disappointment, or go to the ISAAC Website http://isaac.org.au for more details.

Ted Green:

Ted, a founder member of the Ancient Tree Forum, travels world wide to raise the profile of ancient trees.Ted grew up on the edge of Windsor Great Park, home to some of the finest ancient trees in Europe and many have been special to him from childhood. He is a consultant to the Crown Estates there.Ted has worked on plant pathology at London University. He is a regular writer and broadcaster and campaignstirelessly to make sure that we understand why these trees are special and to encourage anyone who will listen to take action on their behalf.Veteran Tree Management and Conservation or Growing downwards: what can we learn fromancient trees and the natural aging process‘An oak tree grows for 300 years, rests for 300 years and then spends the next 300 years gracefully expiring’. Hence the phrase ‘growing downwards’.Growing downwards was a concept developed by the Ancient Tree Forum, a group of Europe-wide specialists andexperts made up of primarily professional arborists, foresters, historians and conservationists. They are concerned about the continued loss of Europe’s old trees.Studying the way old trees age has provided so many insights into how trees grow naturally to maturity, rest andthen decline. This has led to some methods of management preventing collapse such as retrenchment pruningespecially in the management of 1000s of old pollard trees that remain in the UK and other limited parts of Europe.The essential role of decay fungi in the hollowing process has led to the phrase: ‘the co-evolutionary relationshipbetween trees and fungi’. Words such as disease and fungal attack are now disappearing from the arborist’svocabulary.Recognising the fundamental role of other groups of fungi in tree health and longevity, has led to the management and retention of dead standing and fallen trees and they are now much more common in the landscape.

Ken James :

Ken James is an engineer at the University of Melbourne, Australia and has been investigating tree biomechanics and dynamic wind forces on trees for ten years. He currently is conducting research into tree dynamics and has developed new instruments that can measure the wind loads on trees during storms. He has presented papers at the many international conferences including ISA Conferences in America, Tree biomechanics Conference, Savannah, 2001, European Arboricultural Conferences in Maastricht and Oslo, Australia and New Zealand. He has published several papers on tree biomechanics and is currently developing a dynamic structural model to describe tree movement and loads in high winds. Other research interests include structural loads in tree cables and measurement of internal growth stresses in living trees.Tree BiomechanicsThe mechanical properties of trees is being studied to assess the structural strength and stability under a range of conditions. Understanding the structural properties of trees is fundamental to understanding how trees adapt and survive in their environment. Two methods are used, i.e. statics and dynamics. Static tree pull tests apply forces with ropes to simulate wind loading. Dynamic wind measurements are giving us a different understanding of how trees withstand high winds.Tree dynamics and WindHow trees withstand wind forces is being studied using new instruments that monitor the tree under wind stormconditions. Dynamic analysis is providing information on the forces that impact a tree. This information is being used to assess the stability of trees. Recent wind storms in Melbourne are discussed with some case studies that report on wind loading and the assessment of strength.

Dr David Lonsdale:

Dr David Lonsdale is a consultant, author and educator, specialising in the biology, pathology and mechanicalintegrity of trees. After studying at the universities of Southampton and Manchester, he worked for the BritishForestry Commission for 26 years before going freelance in 2002. His research has involved tree diseases and decay, including the role of latent stress dependent fungi. His many publications include “Principles of Tree Hazard Assessment and Management” (1999). He received the Annual Award of the Arboricultural Association in 1999 and an award for Advancement of Knowledge of Arboriculture from the ISA (UK & Ireland Chapter) in 2001.Tree-related hazards: recognition and assessmentA tendency to fall or to shed parts is the main cause for concern about tree-related hazards from trees. Otherhazards, which will not be mentioned further here, relate to obstruction, poisoning, damage to structures caused by tree growth and subsidence or heave of the ground, related to water uptake by tree roots.Everyone with a responsibility for tree safety should be able to recognise signs that may indicate a potential formechanical failure. Someone with specialist skills and knowledge should, if necessary, inspect such signs in moredetail and assess their significance. Options for conducting general and detailed inspections will be discussed here, with reference to the main signs of potential hazard; these can be summarised as follows:Structural ‘defects’ • Bark inclusions (especially at branch unions)• Cracking/splitting of various kinds• Branch subsidence• Crossing and abrading branchesPotential sites of decay initiation• Wounds from pruning or branch failure• Dysfunctional wood in the centre of the root plates of old trees• Bark wounds, above or below ground• Dead branchesSigns of possible weakness due to decay• Cavities• Dead branches• Exposed, decayed wood• Fruiting of decay fungi (often indicating no more than a need for investigation!)There is much interest in devices for aiding the internal mapping of decay, but these should used only by those with a good understanding of the spatial patterns of decay development, both above and below ground. They should in particular be able to interpret the significance of different types of wounds (e.g. wounds that involve only bark loss or wounds that expose sapwood and/or heartwood or ripewood). They should also understand the tendency for coalescence to occur between decay columns arising from a number of wounds.Structurally weak attachments weakened further by decay• Signs of decay at or near included bark unions• Coppice re-growth on decaying stumps• New growth from positions of previous topping or pollardingSite related information• Soil type and hydrology and hence rooting depth (for the tree species concerned)• Cohesion of soil• Topography (especially regarding steep slopes)Past failure of the tree or of similar trees nearby• Signs of past failure that can be observed during inspection• Types of failure that have been documented (or anecdotally noted by local residents).

Dr Elizabeth Philip:

Dr Elizabeth Philip is currently a Senior Research Officer with the Forest Research Institute Malaysia (FRIM). During her 17 years tenure here, she has spearheaded about eight research and development projects dealing with arboriculture and forestry issues. Amongst the issues addressed in arboriculture are growth and development of urban trees, abiotic factors affecting tree growth and urban trees in mitigating changing weather and climatic change.She is a certified arborist by the ISA. In improving the arboricutural practices in Malaysia, she has developed aprotocol for monitoring tree vitality and detection tree heath decline.Dr Philip has published more than 25 papers in referred journals and presented more than 100 working papers. In addition, she sits in a number of technical committees as well.Environmental Influence on the Growth and Development of TreesE.Philip and Y.Noor AzlinForest Research Institute Malaysia (FRIM), 52 109 Kepong, Selangor, MalaysiaMan’s fast paced development has brought about secondary problems like increased pollution, degradation of theenvironment and affected human well-being. The call for combating further environmental degradation has been discussed in many international fora and resulted in Conventions like Biological Diversity and United NationFramework on Climate Change Convention and others. The call for more public parks, green space and conservation of biological resources is getting greater attention in light with the changing climatic scenarios.This paper will highlight the different environmental influence on tree growth. The influence of water stress,temporary flooding, and soil compaction on the growth of urban trees will be discussed. In addition, environmental services provided by urban trees in Malaysia would be also be discussed. Amongst the services provided are natural biological air filters to air pollution and therapeutic. In addition, they acts filter to reduce the heat-island effects in urban areas. Besides, it is a good platform for inter-cultural activities while preserving each identity. Man has very strong linkages with nature and is reflected in the daily activities of our forefathers. Cities and towns have been named after plants.Remember to forward this to other tree care professionals that may find this useful.

ISAAC's Internet policy prohibits spam so please only distribute ISAAC E-news to those with a genuine interest.

ISAAC MembershipMembership of ISAAC links you to the professional world of practicing arborists and tree managers in Australia. As a member you get discounted entry to ISAAC events, discounts on books and business insurance, as well as the locally produced newsletter 'The Bark'. Full ISA Members also get the ISA's publications 'Journal of Arboriculture' and 'Arborist News'. Membership supports the continued growth in professionalism of arboriculture in Australia. Now is the time to join. If you already are a member, now is the time to recruit someone else.

You can download a membership form right now - http://isaac.org.au/members/join.htm"join online.

If you're looking for great information to pass on to your clients, check out the ISA's new website, Trees Are Good, dedicated to providing tree care information for the general public http://www.treesaregood.org

Do you have a question or comment? You can send your query online at our http://isaac.org.au/contact.htm If you would like to subscribe or unsubscribe, please see the instructions on our website http://isaac.org.au/news/news.htm.

Contents of this newsletter are provided for information only and the International Society of Arboriculture, Australia Chapter takes no responsibility for loss or damage resulting from its use. ISA, ISAAC and associated logos are for use by members of the ISA and ISAAC only. (c) 2008 International Society of Arboriculture Australia Chapter Ltd. ABN 77 090 873 644.
_______________________________________________enews mailing listenews@isaac.org.auhttp://isaac.org.au/mailman/listinfo/enews_isaac.org.au

Tuesday, April 22, 2008

ISA HK/China --- Informal Dinner to welcome ISA Certification and Membership Directors

Dear ISA HK/China Station Members & TCHK Members,

ISA HK/China jointly with TCHK are privileged to organize an Informal Dinner to welcome our ISA Certification Director Mr. Derek Vannice, & our ISA Membership Director Mr. Eric Duchinsky, with details as follows:

Date: Saturday May 3, 2008

Time: Seminar starting at 6.30 pm, Dinner starting at 7.30 pm. Vegetarians should have no problem attending this dinner as we try to order as much vegetables as possible. Also, no Shark Fins will be served to be in line for our conservationist members. Anyone joining will be required to pay for the dinner whether he/she would stay to eat or not.

Venue: Hover City Chiu Chow Restaurant (潮豪城洒樓), 1/F, Cheung Sha Wan Plaza, 833 Cheung Sha Wan Road, Kowloon, which is just above Exit A of Lai Chi Kok MTR Station. Tel: 2745 7655

Cost: approx. HK$ 250 person, with total cost to be shared among all participating Station Members at the end of the dinner.

Seminar Topic: The latest development in ISA for credentials & membership internationally. Chinese translation will be provided to any participant not speaking English.

CEU: 1 CEU will be given to any CA participating.

Please kindly note this is a rare opportunity for our Station Members to meet face to face with ISA staff to discuss on any issue of interest for our development. Derek is in charge of all our exams & credentials. Derek will answer any question of yours with regard to ISA credentials locally & overseas. Eric is in charge of ISA membership & he will explain the benefits of being an ISA member as well as membership development around the globe. ISA is developing fast in our region & this event is not an opportunity to be missed by any of our Station Members, ISA joining or not, for update on ISA activities around the globe & in our region. All our CA's & CTW's are requested to come to show your support. .

This invitation is also extended to CAHK, GAIA, KFBG, hktree.com & others for their members to consider to come to meet our ISA Directors in this memorable occasion.

Thank you for your kind attention & please send in your booking at your earliest convenience.

best regards,

Sammy Au
ISA HK/China Station Manager
TCHK Chieftain

Monday, April 14, 2008

ISA HK/China --- CAP 509 OSHO laws on Chainsaw Safety

*** Our weekly Station Mail is for the information of Station Members only, but Station Mail has given up copyright & can be freely circulated. For administrative reasons, comments from outsiders are usually not entertained & may be circulated within our system locally & overseas. Please note Station Mail is sometimes given in Blog at http://isahkchina.blogspot.com , although images are usually not attached due to size. ***

Dear Station Members,

The Station Manager recently received a Top Handle Chainsaw as a gift from a friend after helping him with a tree assessment event. Then it was customary for him to study the Operating Manuel of any power tool upon arrival to make sure all details of the tool were understood before use.

It was stated clearly in the Manuel that "This special chainsaw may be used only by persons trained in tree surgery & maintenance techniques". The same precaution was noticed by the Station Manager on the Manuals of the other 4 Chainsaws that he possessed of various sizes in the past.

Chainsaw is one of the most dangerous tools for tree work in the world. There have been over 30,000 industrial accidents involving chainsaws in North America every year in the past 5 years. ISA HK/China has also reported several chainsaw accidents which happened locally from the media in the past. The Station Manager saw one of his former staff with two fingers cut off in operating a chainsaw carelessly some years ago.

Yet chainsaw is one of Arborist's most favourite tools. Imagine trying to remove a 6 inch limb 40 feet off the ground where lifting platform can not reach which must be done by tree climbing. Would the Arborist pick a hand saw with which he would have to cut for minutes in agony while dangling up there amidst the heat & tension, or would he choose an 8 inch chainsaw where he could finish up the job in seconds? The answer is obvious enough.

It is not known that in HK where any public institutes like CICTA, VTC or horticultural training centres would provide classes on how to operate chainsaws, with tree climbing in particular, to follow international requirements. Govt Depts would offer the training but only to their own staff. TCHK (http://hk.myblog.yahoo.com/treeclimbinghk) is planning to open classes in end May to conduct chainsaw training. In reality, there are very few tree professionals in HK experienced enough to teach chainsaws.

CAP 509 OSHO Ordinance of HK stipulates that:

Occupational Safety and Health Ordinance (CAP 509) and subsidiary regulations

Detail: regulate safety and health at work of all economic activities (both industrial and non-industrial establishments). The scope has been expanded to cover offices, commercial premises, educational institutions, hospitals, clinics, laboratories and other workplaces. The legislation imposes general duty of care on employers, occupiers of premises and employees, and set down basic requirements in accident prevention, fire prevention, working environment, workplace hygiene, first aid, manual handling operation and use of display screen equipment.

Chapter: 509
Title: OCCUPATIONAL SAFETY AND HEALTH ORDINANCE
Gazette Number: L.N. 230 of 1998 Section: 6
Heading: Employers to ensure safety and health of employees
Version Date: 01/06/1998

PART II : RESPONSIBILITY FOR SAFETY AND HEALTH OF EMPLOYEES AT WORK

(1) Every employer must, so far as reasonably practicable, ensure the safety and health at work of all the employer's employees.(2) The cases in which an employer fails to comply with subsection (1) include (but are not limited to) the following-

(a) a failure to provide or maintain plant and systems of work that are, so far as reasonably practicable, safe and without risks to health;(b) a failure to make arrangements for ensuring, so far as reasonably practicable, safety and absence of risks to health in connection with the use, handling, storage or transport of plant or substances;(c) a failure to provide such information, instruction, training and supervision as may be necessary to ensure, so far as reasonably practicable, the safety and health at work of the employer's employees;(d) as regards any workplace under the employer's control-

(i) a failure to maintain the workplace in a condition that is, so far as reasonably practicable, safe and without risks to health; or(ii) a failure to provide or maintain means of access to and egress from the workplace that are, so far as reasonably practicable, safe and without any such risks;(e) a failure to provide or maintain a working environment for the employer's employees that is, so far as reasonably practicable, safe and without risks to health.

(3) An employer who fails to comply with subsection (1) commits an offence and is liable on conviction to a fine of $200000.(4) An employer who fails to comply with subsection (1) intentionally, knowingly or recklessly commits an offence and is liable on conviction to a fine of $200000 and to imprisonment for 6 months.

Although the final interpretation will be carried out in Court, it is likely that any employer not providing training & approved safety equipment in using a chainsaw may be breaching CAP 509, if accused. This will be particularly true if any chainsaw accident has occurred.

Chainsaws are believed to be used daily in our territory in landscaping work. With high exposure to such a very dangerous tool, not getting training & using approved safety equipment would be inviting troubles. While our Safety Officers require procedures & licensing in many aspects of industrial work, why should our chainsaws be a giveaway?

Would HK practise double standard for safety when it comes to chainsaws, & why?

best regards,

Sammy Au
Station Manager

The ISA Mission - Through research, technology, and education, promote the professional practice of arboriculture and foster a greater public awareness of the benefits of trees. (www.isa-arbor.com)

Friday, April 11, 2008

ISA HK/China --- Absence of Sammy Au in HK from Apr 17 - 19, 2008

Dear Station Members,

Please kindly note the Station Manager will be absent in HK from Apr 17 - 19, 2008 inclusive. He will be conducting a Nursery Stocks Standards & Structural Pruning Workshop at the National Parks Boards of the Singapore Govt (Nparks) for their local & South East Asian nurserymen & landscapers during this period in Singapore.

For anyone trying to catch the Station Manager for anything (exam, training, tree inspection, risk assessment, research, conferences, tree climbing, ETF trees, overseas liaison, legal advice, tree news, etc.), please try to contact him before his departure, or after. During his stay in Singapore, maybe the only way to find him is through e-mail & that's unlikely to be during day time.

Thank you for your kind attention & understanding on this notice.

best regards,

Sammy Au
Station Manager

Thursday, April 10, 2008

ISA HK/China --- 2008 Root Barriers Research


*** Our weekly Station Mail is for the information of Station Members only, but Station Mail has given up copyright & can be freely circulated. For administrative reasons, comments from outsiders are usually not entertained & may be circulated within our system locally & overseas. Please note Station Mail is sometimes given in Blog at http://isahkchina.blogspot.com , although images are usually not attached due to size. ***

Dear Station Members,

Attached is the latest Root Barriers research in 2008 published by ISA for your interesting information & studies.

Root barriers are increasingly used in our territory for root control especially for trees. However over the years, the Station Manager has not seen the effectiveness of the chosen root barriers to control roots of invasive species, e.g. Ficus, in our territory. He has also seen grass barriers used in place for controlling tree roots which turned out to be an expensive joke.

Most of the root barriers research around the world has been focusing on temperate tree species so far, & very little has been published on tropical species unfortunately. It is a known fact that tropical trees would grow faster, become more aggressive & more tolerant to abuses than temperate trees in their adaptation to environmental stresses. Just look at how our roadside trees are surviving is evident enough to suggest that more research should be carried on tropical trees. Unfortunately, it appears that Singapore is the only country in our region carrying out any valid research on tree care for this purpose. No research has been published internationally from HK in this area despite our resources.

Engineers & plumbers working for underground utilities have always found blocked drains by tree roots a nightmare in our territory. In our city where everyone & everything would fight for space, & with our public wanting trees wherever there is an open space, if the wrong trees are put on top of a leaking drain, even the best root barriers so available up to date may not control the problem. Tree roots would somehow find their way into the wet & cool environment created by drains. Species selection appears to be the paramount consideration, with proper pipe sealing & careful workmanship to be next.

Under current research, there appears to be no definite guidelines into how & which root barrier is best for a designated underground condition. Suggestions are flying everywhere, but it would be still up to the trail & error of the practitioners to find out what is going to work best for them. More research would go on in this topic & hopefully the future Arborists would find a way to try to deal with the ever challenging situation in the underground world.

best regards,

Sammy Au
Station Manager

The ISA Mission - Through research, technology, and education, promote the professional practice of arboriculture and foster a greater public awareness of the benefits of trees. (http://www.isa-arbor.com/)

Monday, April 7, 2008

ISA HK/China --- HK Tree News (Tree Climbing Accident in Yuen Long)



*** Our weekly Station Mail is for the information of Station Members only, but Station Mail has given up copyright & can be freely circulated. For administrative reasons, comments from outsiders are usually not entertained & may be circulated within our system locally & overseas. Please note Station Mail is sometimes given in Blog at http://isahkchina.blogspot.com , although images are usually not attached due to size. ***

Dear Station Members,

Attached is an unnoticed local news on a Tree Climbing Accident happened on Apr 5, 2008 in Yuen Long. A young man of age 21 worried that the over-growth of a tree covering his house might break to damage the roof. He climbed & tried to cut off the offensive branches apparently without PPE & approved climbing equipment, & then fell to injure himself during the work. He was hospitalized at the end with broken legs.

Tree Climbing is dangerous !! Accident involving tree work has been ranking the top 5 industrial accident in North America for years. It has killed or injured more people than the police & firemen put together over there at one time. Anybody climbing a tree should be trained & properly equipped.

On the other hand, when we look at the current contract requirement for tree work in our territory, hardly any contract would require the tree worker to be trained for tree climbing for the work. So what would be the consequence if one does not climb, say, for pruning? If no climbing is performed, the worker would usually prune trees from bottoms up to remove the lower branches sequentially with a long Pole Saw. In time, the trees would grow taller in response to the lower branches being removed as compensation to regain foliage for Photosynthesis. Then the next pruning would remove more lower branches in the same manner. And the trees would grow even taller to produce more foliage on top. Hence the vicious cycle repeats.

Then can we do it with a bucket truck to reach within or above? It would be a safety violation if one tries to poke through the tree canopy with a bucket carrying a tree worker, because the fallen branches may hit the bucket, besides the boom of the crane can not manoeuvre safely within the branch structures. No licensed crane operator would like to risk that.

If anyone would study our urban trees after pruning for a few years, would the trees not usually be 'lion-tailed' with the lower branches removed mostly? Then how would 'lion-tailed' trees perform in the wind? With a higher Centre of Wind Pressure, they would break more easily in the same velocity of wind with a bigger Bending Moment. This may be why we have so many trees & branches failing after storms & typhoons, besides picking poor quality stocks & incorrect tree selection perhaps.

On the other hand, how can we require our tree workers to be trained for tree climbing, if our landscape supervisors can not climb themselves? This is a million dollar question indeed.

Singapore has begun to require their tree workers to learn tree climbing in their landscape contracts, even though Singapore does not have the typhoons that we know of. How should HK proceed? It also appeared that our CAP 509 Occupational Safety & Health Ordinance would require any worker to be properly trained for his/her duty of work, which may include tree climbing when tree work is to be performed. Are we breaking any laws as such without even knowing?

If anyone would still think tree climbing can be carried out without proper training & approved equipment, maybe he/she would like to consult this poor young man who just broke his legs in the news ...

best regards,

Sammy Au
Station Manager

The ISA Mission - Through research, technology, and education, promote the professional practice of arboriculture and foster a greater public awareness of the benefits of trees. (http://www.isa-arbor.com/)

Wednesday, April 2, 2008

ISA HK/China --- Arborists are just Tree Men?

*** Our weekly Station Mail is for the information of Station Members only, but Station Mail has given up copyright & can be freely circulated. For administrative reasons, comments from outsiders are usually not entertained & may be circulated within our system locally & overseas. Please note Station Mail is sometimes given in Blog at http://isahkchina.blogspot.com , although images are usually not attached due to size. ***

Dear xxx,

Thank you for your enquiry & we are broadcasting our reply to you in an open Station Mail so that some of our Station Members can also understand the knowledge contained. Please note that it is our Station Policy that any communication coming in can be circulated within our channels for our internal discussion. However, it is customary that we would hide your personal information so that your identity is not disclosed, unless the attack is malicious.

Your claim that Arborists are just Tree Men only can be right to a certain extent in that Arborists would usually deal with trees in urban landscape. However, the Arborist profession would usually go beyond that to study only trees & would branch out into the following disciplines as recently demanded for research in the Arboriculture & Urban Forestry Journal of ISA as follows:

1. Entomology --- The studies of insects, since some insects attack trees.

2. Social Issues & Economic Assessment --- Trees in community affects quality of living & residents' behaviour

3. Soils / Fertilization / Irrigation --- Trees need a good medium to grow well.

4. Biomechanics / Safety / Hazard / Risk --- Mature Trees can be Time Bombs if not properly cared for.

5. Pathology --- Trees, like animals including humans, can become sick.

6. Horticulture / Transplanting / Construction Damage --- the cultural practice & knowledge in keeping trees in good condition.

7. Tree Biology / Physiology / Genetics --- Arborists are Tree Doctors & Tree Detectives.

8. Urban Forest Management / Modelling / Assessment --- Like how human population is managed in a city, tree community would also require management to avoid competition, risk & undesirable growth.

9. Utilities Forestry --- Many parts of the world would have trees, be they wild or landscaped, growing underneath power lines to touch the high voltage above. These tress would need to be managed to reduce risks.

10. Ecology / Urban Interface --- Without trees, the wildlife we know on land may disappear. Trees impact the image of a city & quality of living of a community.

As you can now see, you are correct in the sense that Arborists are Tree Men because we deal mainly with trees, like doctors would mainly deal with humans & not animals. However, the knowledge of an Arborist may stretch far beyond that of just identifying trees & talking about 'flowering' like what you would anticipate. We do not & can not ignore the environment surrounding trees to help them grow well. Arborists are generally practitioners to solve problems on site.

It is also rather unusual that any single Arborist would be expert in many fields, since each field has its own depth & speciality. That's why in many quality Arborist training or discussion, usually the Arborist specializing in one field would focus on his own subject, & would leave the other areas to different experts. I personally do not know of any Arborist who is a master of all.

Arborists in our territory do not have the intention to take over the greenery as you may have hinted, but we would like to be part of the team to provide our knowledge to help bring a better tree community for the benefit of our society. Arboriculture is new to our territory, but ISA is already 84 years old, & is strongly established in many western countries including Singapore. Just compare our trees with that of Singapore & ask yourself whether Arboriculture is doing good or not for the community. Trees in Singapore are designed, installed, maintained, inspected, risk-assessed & preserved by Arborists in their community.

To become a Certified Arborist (CA) is like obtaining an entrance ticket to the Hall of Arboriculture & would not usually make you an instant professional, unless you already are, as demonstrated in many parts of the world. CA is a credential to ascertain a level of knowledge. CA exam also does not test a candidate for communication skills & practical knowledge like in-situ pruning. Many of the topics mentioned above would require research & self-study for personal development after being a CA. Around the world, most CA do not actually go into practice because practising involves legal liabilities. Practising Arborists (PA) frequently go to Court, for one reason or another. CA may not be the equivalent of PA, & that's something you may wish to understand & consider before you wish to obtain the credential.

I hope my information above can be of help to you.

Thank you for your enquiry again & please do not hesitate to contact us anytime for any question you may have.

Yours faithfully,

Sammy Au
ISA HK/China Station Manager
Professional Nurseryman, Practising Arborist & Landscaper

The ISA Mission - Through research, technology, and education, promote the professional practice of arboriculture and foster a greater public awareness of the benefits of trees. (http://www.isa-arbor.com/)

Sunday, March 30, 2008

ISA HK/China --- HK Tree News (Wong Tai Sin Tree Failure)


*** Our weekly Station Mail is for the information of Station Members only, but Station Mail has given up copyright & can be freely circulated. For administrative reasons, comments from outsiders are usually not entertained & may be circulated within our system locally & overseas. Please note Station Mail is sometimes given in Blog at http://isahkchina.blogspot.com/ , although images are usually not attached due to size. ***

Dear Station Members,

The recent Wong Tai Sin Tree Failure has been causing havoc in the media as per attached & on the internet. This Station really felt sorry for the Govt Depts handling it & could only wish the media can be placed in the same shoes sometimes to enjoy the criticism.

From verbal reports of Station Members who have visited the site, the problem appeared to be Erythrina Gall Wasps which had weakened the tree to the failure point. Then wind & rain catalysed the failure like everywhere else for tree failure in the world. What were seen as decay & pest attack appeared to be secondary to the primary initiation.

If the case would go to Court with the tree owner sued for Negligence by the victim, the plaintiff lawyer with the help of an experienced Arborist could possibly point out many accounts of lack of care in the maintenance of this tree. The chance of winning a hefty damages may be promising.

Besides monetary compensation, what would happen if this Chinese visitor went home & told his folks that the trees in HK are killers & he nearly kicked the bucket for it? Would our brothers & sisters up north with their thirsting media not enlarge the event to out of proportion for one reason or another? Yet in HK we are supposed to have an advanced landscape.

Possibly this Erythrina was selected for ' flowering' during the design & at that time, maybe we did not understand enough about trees to be careful. Since now that we have so many trees selected for ' flowering' without much consideration for Structure & Wind Stability, we may have some worries indeed to tend our trees.

Famous Arboricultural sayings passed down from experts would include:

1. If a tree is not designed, installed, maintained, inspected & risk assessed properly, it is likely to become a liability rather than an asset.

2. Mature Trees can be Time Bombs if not attended properly.

3. In any Tree Selection, it is always Mother Nature makes the rules, not us.

Only if experienced & qualified Arborists would have regularly inspected & risk-assessed our many Mature Trees in our territory, & to produce Arborist Reports to ascertain recommendations & responsibilities, then event as such in Wong Tai Sin would possibly fall upon the liabilities of the Arborist, not that of the Govt Depts.

For future planning, tragedy like Wong Tai Sin may be proportionally reduced by getting Arborists involved in the design, installation, maintenance, inspection & risk assessment of trees in our urban landscape. This is what western countries including Singapore would do. They have City Arborists & Urban Foresters to look after their trees. Why should we not?

Our typhoon season is about to come & one rainy night has already seen major incident as such for our Mature Tree Failure. What would happen if we get another mini-typhoon like Prapiroon of 2006 to visit us later on? Are we still able to claim the subsequent tree failures, damages & disruption all ' Acts of God ' ?

Only if HK can put Arborists back on stage to look after our trees like western countries, then maybe our trees would become safer, better looking & perhaps even happier in our territory?

best regards,

Sammy Au
Station Manager

The ISA Mission - Through research, technology, and education, promote the professional practice of arboriculture and foster a greater public awareness of the benefits of trees. (http://www.isa-arbor.com/)

Thursday, March 27, 2008

ISA HK/Chia --- Introduction to IPM (Part 3 & 4)


*** Our weekly Station Mail is for the information of Station Members only, but Station Mail has given up copyright & can be freely circulated. For administrative reasons, comments from outsiders are usually not entertained & may be circulated within our system locally & overseas. Please note Station Mail is sometimes given in Blog at http://isahkchina.blogspot.com/ , although images are usually not attached due to size. ***

Dear Station Members,

Further to the issue of the Part 1 & 2 of the same article a few weeks ago, please kindly find the remaining Part 3 & 4 in consecutive Station Mail to complete this series.

The attached article advised upon how to implement IPM together with PHC. After all, what's good is it to know the benefits of IPM but not knowing how to apply? Arboriculture is a Practitioner Trade & Arborists are front-line professionals solving problems on the spot. It is therefore important for them to understand how to deal with practical situation at all time.

Many trees in our territory actually developed symptoms from poor nursery stock selection & incorrect cultural practice without the landscapers really knowing why. For example, China stocks are usually planted very close together like sugar canes with trunks shaded from canopies during production. When a selected tree is pulled out from the crowd, the trunk without Taper which has been protected from sunlight all the time would be suddenly exposed to light & wind. Many would develop sunscald in this manner which would lead to cracks & then wounds; & to cavities & eventually decay. With decay in trunk & branches, there is always a chance for failure in the wind.

Another major challenge for China stocks is that they would usually come with undersized rootballs. An internationally acceptable rootball would be at least 10 times the size of the trunk diameter, i.e. a 3 inch trunk would come with a 30 inch rootball. This is to ensure that the transplanted tree could retain adequate roots to carry on the normal functions demanded by a tree. Without enough roots, the tree would go into ' Transplant Shock', & would sit there suffering or dying, defeating the purpose of installing a tree in landscape. Yet tree arrival on site is rarely inspected on the spot before installation in our territory. Post planting inspection is usually carried out, but this will be too late to spot for anything especially rootball size. The tree would then develop symptom of one or the other later on without anybody knowing why.

Other common defects associated with China stocks would be Girdling Roots due to production in containers, & incorrect pruning such as Topping which produces large wound & destroys Tree Structure. A lot of trees are also installed with added fertilizers in the backfill which would burn off the emerging roots to impede recovery. Symptoms would eventually appear.

The combination of poor nursery stocks & incorrect cultural practices is actually harming our trees. Sophistication in chemical spray appears to be the depended solution in our territory. Some tend to think that the better we spray, the better trees we'll get.

Then does it work out this way?

Please try to find the answers in the attached article.

best regards,

Sammy Au
Station Manager

The ISA Mission - Through research, technology, and education, promote the professional practice of arboriculture and foster a greater public awareness of the benefits of trees. (http://www.isa-arbor.com/)

Friday, March 14, 2008

ISA HK/China --- Informal Dinner to welcome Mr. James Urban

Dear ISA HK/China Station Members & TCHK Members,

ISA HK/China jointly with TCHK are privileged to be able to invite the internationally famous Landscape Architect & Urban Forester, Mr. James Urban, to attend an Informal Dinner hosted in his honour by our Members, with details as follows:

Date: Thursday Mar 27, 2008

Time: Seminar starting at 6.30 pm, Buffet Dinner starting at 7.30 pm. Vegetarians should have no problem attending this dinner. Also, no Shark Fins will be served to be in line for our conservationist members. Anyone joining will be required to pay for the dinner whether he/she would stay to eat or not.

Venue: Hover City Chiu Chow Restaurant (潮豪城洒樓), 1/F, Cheung Sha Wan Plaza, 833 Cheung Sha Wan Road, Kowloon, which is just above Exit A of Lai Chi Kok MTR Station. Tel: 2745 7655

Cost: approx. HK$ 250 person, with total cost to be shared among all participating Station Members at the end of the dinner.

Seminar Topic: Urban Soil & Trees seen by Mr. Urban during his visit to Singapore, HK & China.

Capacity: 60 persons

CEU: 1 CEU will be given to any CA participating.

Please kindly note this is a rare opportunity for HK people to meet face to face with an internationally renowned expert in Urban Soil & Trees. Mr. Urban needs little introduction by this Station to be a respectable gentleman & knowledgeable professional in the field of urban landscape. His presence is sought around the world for expertise on landscape design as well as tree planting. This is not an opportunity to be missed by our landscapers or anybody interested in tree planting indeed.

For those of you who missed the booking for the educational CEDD seminar of Mr. Urban on Mar 25, maybe you would like to quickly book on this one to avoid another disappointment.

This invitation is also extended to CAHK, GAIA, KFBG, hktree.com & others for their members to consider to come to meet Mr. Urban in this memorable occasion.

Thank you for your kind attention & please book at your earliest convenience.

best regards,

Sammy Au
ISA HK/China Station Manager
TCHK Chieftain

Information of Mr. James Urban

Mr Urban is an internationally acclaimed expert in landscape architecture, urban architecture and urban soils. He specialises in the design of trees and soils in urban spaces.

Mr Urban has written and lectured extensively on the subject of urban tree planting and has been responsible for the introduction of many innovations including most of the current standards relating to urban tree plantings. He was instrumental in the development of structural cells and structural planting soils for use under sidewalk pavements, micro-root paths and macro-soil trench techniques.

Mr. Urban is the Plant Editor for Landscape Architecture Magazine and the current author of the section in Architectural Graphics on tree preservation, planting and urban tree planting. He is a visiting lecturer on Urban Soils Tree Planting at Harvard University's Graduate School of Design.

Monday, March 10, 2008

ISA HK/China --- 'The Root of the Problem' by James Urban

*** Our weekly Station Mail is for the information of Station Members only, but Station Mail has given up copyright & can be freely circulated. For administrative reasons, comments from outsiders are usually not entertained & may be circulated within our system locally & overseas. Please note Station Mail is sometimes given in Blog at http://isahkchina.blogspot.com , although images are usually not attached due to size. ***

Dear Station Members,

This Station apologizes to bombard our Station Members lately with various kind of research, but arboriculture is just full of research. In fact, if the Station Manager is not working or tree climbing, he will be burying himself in the latest research. There is just too much an Arborist would need to learn to stay in practice to handle the ever changing situation. Obtaining a credential is merely pushing open the gate.

Attached is an article recently given to this Station by the internationally acclaimed Mr. James Urban who will be visiting HK very soon. Mr. Urban needs little introduction as an internationally renowned Landscape Architect & Urban Forester to anyone knowledgeable in the landscape practice. His article here was meant for sharing with our 610 no. of Station Members for our update on the latest international practice on tree production & nursery stock standards.

This article would challenge our conventional wisdom of using Containerized Trees & plants which have been advocated by a lot of our local landscapers to be without 'Transplant Shock' & would give 'Instant Effect' after planting. However, Mr. Urban reckoned that nearly any kind of Containerization would lead to the development of Circling/Girdling Roots, which can lead to future poor growth or even toppling in wind if unchecked. Mr. Urban also reckoned to use Bare Root Trees to avoid this problem.

On the other hand, a new nursery stocks standard has been jointly developed by the ISA, American Nursery & Landscape Association (ANLA) & the American Society of Landscape Architects (ASLA) in 2005 to state that a minimum of two main roots must be within 3 inches of the rootball soil line as measured 4 inches from the trunk, for any nursery tree to be acceptable in urban planting. Further information on this topic can be obtained at :

http://www.anla.org/applications/Documents/Docs/Structural_Root_Depth_BMP_-_Final_Format_July_2005.pdf

It is also reckoned that an inch of soil can be left over the roots to avoid damaging the root surface during the planting operation.

In ETF, tree production has been following the above-mentioned practice since the beginning of operation in 2005. ISA's guidelines for tree production are not to have Girdling Roots nor deeply planted roots, & the minimum rootball size should be around 10 x trunk diameter. Containerization is discouraged in ETF to avoid any tendency to produce Girdling Roots. Uphill potting of seedlings at ETF is inspected every week to ensure no Circling Roots development, or to be planted into ground once circling began to appear. Any tree found planted too deep in ETF will be removed & replaced.

Such are the requirements to produce any quality trees, & quality trees would save maintenance & minimize future failure in a landscape. These are also the points ignored by our brothers & sisters up north because their landscape specifications have no requirements up to this level. HK can certainly do better than that.

The attached article was written by an international Landscape Architect on the latest research & finding. It should serve as a good reference by our local landscapers to help source & install our trees, as well as to match our current practice with the world. HK is an international city where visitors can compare, & we have regular storms & typhoons every year. Having better trees would provide better & safer landscape, & our city is wealthy enough to select better trees. HK is Third World no more.

Do we not agree?

best regards,

Sammy Au
Station Manager

The ISA Mission - Through research, technology, and education, promote the professional practice of arboriculture and foster a greater public awareness of the benefits of trees. (www.isa-arbor.com)

Thursday, March 6, 2008

ISA HK/China --- 2008 Research on the Benefits of City Trees


*** Our weekly Station Mail is for the information of Station Members only, but Station Mail has given up copyright & can be freely circulated. For administrative reasons, comments from outsiders are usually not entertained & may be circulated within our system locally & overseas. Please note Station Mail is sometimes given in Blog at http://isahkchina.blogspot.com/ , although images are usually not attached due to size. ***

Dear Station Members,

Traditionally in HK & China, trees in landscape are selected mostly for the benefit of flowering. However for a tree, flowering is meant for attracting mammals & insects for reproduction, & flowers are usually on top & edge of a tree to be seen by these creatures, without consideration of human enjoyment. Therefore, if someone rests underneath a tree & looks up, he would see hardly any flower which is usually the case in our urban setting. Flowering also creates debris when the inflorescence & fruits drop, giving hygienic problem & unsightliness. When a 'flowering' tree is not selected properly for a specific growing condition, the tree may not flower, or just flower once only by burning off the remaining energy.

Another conventional criteria in picking a tree would be to match a tree with the name of a place, e.g. Bougainvillea for ' Bougainvillea Court' & Cherry for Cherry Lane, usually without much consideration whether it is the 'Right Tree for the Right Place' & as long as it looks good on paper. Just look at how many Bahinias are planted all over HK in recent years.

The benefits of trees are certainly more than just for flowering & christening a place. Trees regulate temperature, reduce run-off during storm, hide unwanted view, reduce air pollution, enhance ecological balance, promote social & psychological harmony, & many others. Just when trees are selected for flowering alone does not mean the other benefits should be buried & ignored, & there are more reasons to select a tree just for flowering.

The attached research from ISA gave a rarely mentioned benefit of City Trees in promoting the health & stamina of residents by encouraging them to exercise physically. This research has shown that humans enjoy hanging around environment with trees. In older day China, rural villages would almost without exception plant selected tree species around the vicinity. Some said it was for Fung Shui. This Station would reckon it was for better than that, e.g. firewood, food, shade & herbal medicines. Trees there were a necessity then, & hardly for the reason of flowering.

In the Tree Supervision lecture of the Station Manager at CITA, the first question to throw out to challenge the candidates would be whether anyone would enjoy living in a desert. A desert has no tree. The Station Manager has not yet heard anyone replying that they would enjoy living in a place with no tree. Trees are part of our life in the back of our mind, & therefore they should be planted & protected.

If trees are so important, we would need to learn how to design, select, plant, maintain & inspect trees, because if a tree is not properly so done so, it is likely to become a time bomb for our city. Just look at how many tree failures we have after storms & never mind after the regular typhoons. Trees should be selected for more than just flowering, but also for good Structure & Health to stand against wind. The right trees must go into the right places so that we can enjoy their benefits.

In order to do this, the first step is to learn what a 'good' tree should be because planting, maintenance including Structural Pruning, inspection & risk assessment will base upon how to obtain a 'good' tree. Hence it is always the emphasis of this Station in any of arbor introduction to first inform on how a 'good' tree should look & stay like, since everything else will come from & try to imitate that.

Trees in HK are our valuable assets. We appear to be losing them in our continuous development & we should preserve & protect the existing ones. But we shall need to know how. When we plant new trees, we should also re-vitalize our landscape with good quality ones rather than just hunting for the cheapest. The cheapest ones usually cost more in maintenance & lead to public complaint when failed. Our older trees are already history & should be given a dignified retreat. The new ones should be our hope & we must select the right ones, or we'll repeat our past mistakes.

Disagreement? Our existing trees are still better to show the world? Why not try to compare with Singapore & get some answers there ...

best regards,

Sammy Au
Station Manager

The ISA Mission - Through research, technology, and education, promote the professional practice of arboriculture and foster a greater public awareness of the benefits of trees. (http://www.isa-arbor.com/)

Monday, March 3, 2008

ISA HK/China --- TCHK's public reply on the benefits of Tree Climbing


Dear Station Members,

TCHK (http://hk.myblog.yahoo.com/treeclimbinghk) has recently published a public reply in Chinese on the enquiry of the benefits of Tree Climbing by an outsider. It is written in a language second to none by a professional to explain the good of Tree Climbing to a non-believer & translated complicated knowledge into laymen term for public understanding. It is worth broadcasting in our 'Professionals' Channel for public viewing.

Tree Climbing has always been part of ISA Arboriculture. It is on Arborist News in every edition & there is an International Tree Climbing Championship in every ISA Conference in the world. Despite its popularity, there is very few literature on the description of Tree climbing, because it is such a fast moving industry that by the time the book is printed, the technology has already moved ahead.

Please enjoy this interesting article written in colloquial Cantonese for the understanding of the majority of TCHK Members.

best regards,


Sammy Au
Station Manager


攀爬一族 重要家書 2號 (攀樹有何好處?)

有人問:

我唔係你地族人,但係上網成日見到你地係度吹噓話攀樹点正点好,咁我玩第二D運動唔得嘅咩,点解要學攀樹? 你地有無D乜野可以Ling出黎詳細解釋吓點解攀樹咁好丫!

族長親自答:

老兄你講得出依番說話,雖然我倆素未謀面,但本族長都幾敢肯定你可能從未試過真正用過‘器材攀樹’同埋上過好高,否則你未必會咁樣講嘅。我依家以我半老人家嘅身份嚟同你解釋,希望你會明白箇中道理。

攀樹同其他危險運動嘅最大嘅分別就係攀樹嘅專注力係會係與別不同。舉例講,攞游水嚟比,如果你游緊果陣唔集中精神,最多你會游慢D或且飲兩啖水,唔會成个即刻沉左落去掛?咁同攀石比又点呀?攀石嘅初級一般都係用手用腳抓住舊石一步一步上去,而身上條繩就主要用嚟防墜,个人企係舊石上便係唔會俾D風吹嚟擺去,會係企定定咁樣成个人貼住舊石係度等下一步嘅。

攀樹就非常唔同。就算你係用「身體推行法」貼住棵樹「豬仔爬」上去,須知道唔係棵棵樹都直筆甩咁俾你貼住爬上去,只要你叉錯一腳就可能會成个人「甩樹」,飛左出去半空中好似只蜘蛛咁樣吊下吊下,都咪話唔夠剌激。如果用‘腳鎖式’上樹果陣就更加唔使講添喇,一定係乜野都點唔到,除左自己、空氣同埋條繩,係咁半天吊聽天由命。

攀樹係真正嘅「命懸一線」,條繩就係攀樹人條命,條繩如果有乜冬瓜豆腐,个人亦都跟埋條繩去冬瓜豆腐。攀樹工作至今都依然係全美洲五大工業意外之一,曽經試過一年內傷亡人數比起果度D警察同埋消防員加埋重要多三倍,咁你話夠剌激未?

咁危險咁又点解去學攀樹呀?其實國際上嘅‘器材攀樹’實質上有一套非常嚴謹嘅安全守則,往往係D人唔肯去學或者一於少埋先至會出事。攀樹其實唔比跳傘或者深海潛水危險,多數出事嘅人都係叻過龍果D人,好少係正常循規道矩嘅人。

係我地當今大都市裡便,人與人之間經常互相猜疑,互相鬥爭,在公在私都要日日對住部電腦,一上班果陣就文山會海,議而不決,到左落班果陣,重話走去跑步游水?都已經晚上八点几喇。

但係,如果趁住星期六、日、成班人圍埋係棵樹腳下便拋下沙袋,掛下繩,然後「豬仔爬」上去几米坐係條樹丫上便叫下映下相,我試過見過D成六十歲嘅婆頭都開心到變番十六歲嘅妹丁,佢地果種童真歡樂係由內心裡邊自發出嚟,唔係扮得到架。

我又見過有D大則師大工程師,平日Jit 到唔笑,但係一立住條繩上樹就馬上成只開籠雀咁、鬼咁多野問,鬼咁多野講,跟住一「豬仔爬」上去就用埋飲奶D力,咬牙切齒咁一邊唱「誓要去,入刀山,浩氣壯,過千關 ……..」,死都要捱埋果三、五米高度,拉到成双手甩晒皮都無所謂,上到去上便果陣叉開双手係度大鵬展翅映相,落番地果陣重解壓過考完果大學畢業試,咁你話有益定無益?

鳳溪攀樹隊果班年青人,本族長係教佢地開頭果陣,裡便有打交天王,逃學聖手,多情小生,佢地大部份無心向學,有D由尾數番上頭全級考第二,好多如果係星加坡住早就打晒藤條,佢地黎學攀樹完全係嚟碰下運氣。但係俾本族長又讚又嚇咁教左幾个月之後,考包尾嘅變成全班考十幾,打交嘅留番D力嚟爬樹,而且全部人好緊張咁學英文,因為大部份攀樹知識都係用英文嚟寫。

由此可見,攀樹有乜好?就係真情歡樂,身心健康,精神減壓,注意力集中,服從紀律,建立自信,熱血自豪,環境保育,回歸自然 ……… 重有……… 重有… 我地‘攀爬一族’ 嘅口號係:


攀爬一族,非凡脫俗。能人不能,樹上貴族。


本族長已半百歲人,後生果陣走遍全球各地,跳傘潛水攀山打獵乜都試過,但我可以話俾你知,無一樣野會比攀樹更加剌激,係更有滿足感嘅。

唔信我?咁你又試過攀樹未?点解唔嚟試下再講吖??

ISA HK/China --- TCHK training, certificate & insurance

*** Our weekly Station Mail is for the information of Station Members only, but Station Mail has given up copyright & can be freely circulated. For administrative reasons, comments from outsiders are usually not entertained & may be circulated within our system locally & overseas. Please note Station Mail is sometimes given in Blog at http://isahkchina.blogspot.com , although images are usually not attached due to size. ***

Dear Station Members,

Please kindly find attached the latest announcement of TCHK (http://hk.myblog.yahoo.com/treeclimbinghk) in Chinese with regard to minimum attendance, certificate to be conferred & insurance offer, for those who are interested. Continuous intake is coming in from all sectors of society & TCHK has the intention to become a recognized body by Govt Depts to train Tree Workers in HK for skills & safety. TCHK will also spread into China in due course.

TCHK is the answer to Station Members who constantly enquire for training & certificates locally in the Chinese language, together for any contractor & staff. TCHK can tailor make training for institutes & organization in English or Chinese to satisfy their requirement. TCHK can also train any age or qualification, has an independent administration & links up with ISA HK/China & ETF to offer a complete set of arbor knowledge & practice. Govt Depts can certainly consider to send their contractors & staff to TCHK training for practice & safety.

Looking forward to anyone applying for TCHK training in due course.

best regards,

Sammy Au
Station Manager

The ISA Mission - Through research, technology, and education, promote the professional practice of arboriculture and foster a greater public awareness of the benefits of trees. (www.isa-arbor.com)

Thursday, February 28, 2008

ISA HK/China --- 2008 reaearch on Tree Staking


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Dear Station Members,

Attached is the latest research published by ISA on Tree Staking.

Tree Staking is a requirement in nearly every landscape contract in HK & China nowadays. The general spirit is that it should be done with the strongest material as possible & should be there for as long as possible, because it is thought that Tree Staking would stabilize the tree in wind & storm. Another obvious reason for staking may be the undersized rootball of nursery trees coming in from China which can not stand itself after installation & would require staking. On the other hand, if a wind force of typhoon magnitude would strike directly upon a tree secured with a rigid staking system, maybe if the system can stand the wind, the tree is likely to break or snap (basic Tree Biomechanics).

HK is full of Tree Staking lasting for years, especially in the private sector. Some stronger one even appeared to last forever. This latest ISA research has given comparison for the pros & cons of Tree Staking & has provided the latest information on current practice. If anyone would disagree with it, please give this Station the opposite research (not a point of view or from a coffee magazine, please) & we are obliged to publish it to show the world. This Station is always fact-finding & truth-telling, & we worship nothing but fact & truth.

Therefore, should our territory carry on the 'permanent staking' for our trees which is required in nearly every landscape specification today? Is the money thrown into Tree Staking justified for the result? Do we get better trees, or poorer, in this manner ?

Please try to find the answers to these questions in the attached article.

best regards,

Sammy Au
Station Manager

The ISA Mission - Through research, technology, and education, promote the professional practice of arboriculture and foster a greater public awareness of the benefits of trees. (http://www.isa-arbor.com/)