Sunday, November 14, 2010

ISA HK/China --- HK Tree News (Tree Failure in Tsuen Wan)

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Dear Station Members,

The newspaper cutting below described how a suspected Araucaria tree had toppled & damaged a Community Centre next to it. The tree was suspected to have Termite Attack from other sources.

ISA HK/China is not interested in the administration & liabilities of this event. However, it should be of interest to our 1,500+ Station Members in the followings:

1. Tree Failure can happen anytime of the year & not confined to rainy seasons. It has been dry for nearly a month before the above incident occurred. Tree Inspection should take care of this & not focusing in the rainy seasons only.

2. Araucaria species appear to be associated frequently with Termite Attack. There have been previous reports & research of this happening. Termites appear to enter the interior trunk of the Araucarias from underground, leaving little visible sign on the exposed surfaces. This is something the Tree Inspector should pay attention to during the inspection.

3. Araucaria species would grow long & slender to 20+ m height over the years. It will appear like a flag pole to catch wind in the sky. Adequate room must be allowed for its root anchorage, or Mother Nature makes the Rules. Araucarias have been planted in their hundreds of thousands as landscaping trees all over HK in the past. Many have reached maturity already.

For those Araucarias grown in confined space, they may gradually turn into Time Bombs. Little have been published in their Wind Stability in confined growth. We are just not sure how safe they will develop in our territory over time.

May the Good Lord now have mercy over our Araucarias in our territory over time, & may our "Tree Assessors" spot their risks, before another bigger incident would occur.

best regards,

Sammy Au
Station Manager

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

"Trees are good for the community. Trees need care like human beings. Arborists are the Tree Care Professionals."

塌樹毀屋 樹木辦又塞責