OAKS

are dying.

Brown leaves indicate the trees have a problem. I suspect that the trees sap is less oily because of the reduced oxygen. The oily sap is a natural repellent to the wood beetles that left the holes in this young oak on the south side of 192 east of Patterson at the top of the hill.

The tree draws water devoid of total dissolved oxygen up through the roots. The tree immediately detects that it cannot use the water for photosynthesis without trace amounts of total dissolved oxygen. Having no other way to get rid of water other than transpiration through the photosynthetic process, the tree can store a certain amount in its trunk between the wood and the bark, the cambium layer. The tree then brings up more water attempting to photosynthesize. Obviously it is finding some total dissolved oxygen or it would die immediately. What happens is the trunk becomes flooded. The flooding between the bark and the wood softens the wood and provides moisture for the beetles while softening the sawdust cuttings making then more compressable speeding the boring. This would explain why selected branches die first until the whole tree is involved. Can we allow NAFTA to usurp U.S. law?

The accumulations of sawdust between the bark and the wood can be easily seen in the bottom left.

9/27/02

I watched this tree die over 3 years.

This majestic mature oak below is on Patterson across from the Post office on the south side of 101.

9/25/02

Sudden Oak death is killing trees in Marin. This is how I think it can be related to reduced oxygen in water.

The tree draws water devoid of total dissolved oxygen up through the roots. The tree immediately detects that it cannot use the water for photosynthesis without trace amounts of total dissolved oxygen. Having no other way to get rid of water other than transpiration through the photosynthetic process, the tree can store a certain amount in its trunk between the wood and the bark, the cambium layer. The tree then brings up more water attempting to photosynthesize. Obviously it is finding some total dissolved oxygen or it would die immediately. What happens is the trunk becomes flooded. Tan Oaks in the Marin area of Northern California that were diagnosed with sudden oak death in the early phases had flooded trunks. The water stored in the trunk becomes stagnate which is then the perfect medium for the phytophora fungus that then takes over the tree via the cambium layer.

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