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Old 10-08-2003, 12:02 AM
Jim Caldwell
 
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Default help...tree is encased in a "spider web"

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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Old 10-08-2003, 12:32 AM
MissGinger
 
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Default help...tree is encased in a "spider web"

tent caterpillars?

http://www.tent-caterpillar.com/

http://www.holoweb.com/nature/insect...terpillars.htm


"Jim Caldwell" wrote in message
...
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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Old 10-08-2003, 02:02 PM
Jim Caldwell
 
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Default help...tree is encased in a "spider web"

Well, the web looks a lot like the web in the picture on the site you
referenced....but I have not found any larvae, caterpillars, cocoons, or
moths. I could only check the branches I could reach from the
ground....could they all have moved up higher? Yet, if so, I shou.ld find
left-behind cocoons and eggs cases. Probably 80 % of the entire tree is
covered with the web. All of the leaves are turning brown, so I think the
whole tree will be defoliated and probably die.

"MissGinger" wrote in message
.. .
tent caterpillars?

http://www.tent-caterpillar.com/

http://www.holoweb.com/nature/insect...terpillars.htm


"Jim Caldwell" wrote in message
...
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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Old 10-08-2003, 08:22 PM
Marley1372
 
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Default help...tree is encased in a "spider web"

Tent caterpilliars usually only make tents in the crotches of trees and by this
time of the year they have already pupated, emerged, and are near laying eggs.
You may want to look up "Euonymus caterpilliar" which is a pest that is known
to cover an entire plant with thier large webs. This is the right season for
them as well. You may also have an incredible infestation of giant mutant
alien spider mites.

Toad
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Old 11-08-2003, 11:22 AM
Chris Owens
 
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Default help...tree is encased in a "spider web"

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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Old 12-08-2003, 02:42 AM
Babberney
 
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Default help...tree is encased in a "spider web"

On Sat, 9 Aug 2003 16:52:54 -0500, "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.


If the webs are only on the branches and not the leaves, it is
probably what I saw in Houston not long ago. I forget what the cause
was (some insect, obviously), but more than one source I looked at
said it is harmless and should not cause any alarm. Try looking
around on the Houston Chronicle web site for more definitive answers.

Keith
For more info about the International Society of Arboriculture, please visit http://www2.champaign.isa-arbor.com/.
For consumer info about tree care, visit http://www2.champaign.isa-arbor.com/.../consumer.html


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