cobwebs in my trees

BCinSC

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Oct 11, 1999
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Several of my trees have this very fine thread web covering the bark on the trunk. It's not those big nests (of moths I think) in the branches. I don't see any critters, but I wonder what it making them and what damage they might do. Variety of trees afflicted.
 

BCinSC

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Oct 11, 1999
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Spiders aren't only things that make webs, there are no spiders visible, and these webs aren't, or don't appear to be, for catching prey. Literally sheaths entire tree.
 

BCinSC

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Oct 11, 1999
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I think tent caterpillars are the ones that wrap the branches and become evil moths - very destructive to the tree. What would this worm do?