It sounds very much as if you have tent caterpillar -- check the
webs just after sunset and see if they have lots of little
caterpillars in them. A tree can generally survive one round of
defoliation if it is gently cared for following removal of the
infestation. In any case, treating a 50+' tree is not a DIY;
call a tree specialist.

Chris Owens

Jim Caldwell wrote:

We have a large tree, over 50 ft. tall, in our yard. It has been very hot
and dry here for several weeks....100+ heat index. The trees leaves have
started turning brown, so I thought it might be needing water. Looking close
at the tree, I found that almost all of the tree branches, from the smallest
down to the trunk, are coverered with what looks like a very fine spider
web. Also, many of the leaves have a white granular substance on them. It is
killing the tree rapidly, but not by cutting off the sunlight, because the
web is so thin, surely it is still getting enough light. Anyway, I could not
see that it was encasing the leaves also. What is causing this? Sorry, I
don't know what kind of ttree it is, but it is not an evergreen, and never
has any fruit or blooms. No other trees in my area seem to have this,
either. There are three other trees on my lot, and they are all fine.


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