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Mr. Smarty Plants - Possible webbing bark lice on oak tree

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Friday - August 08, 2008

From: Austin, TX
Region: Southwest
Topic: Pests, Trees
Title: Possible webbing bark lice on oak tree
Answered by: Nan Hampton

QUESTION:

We live near the Center and have a large live oak tree in our yard. Recently the lower trunk has been covered with thin, white weblike material (not sure if spider web). What could this be and is it dangerous to the tree? Should I brush off with broom or try another solution? Thanks!

ANSWER:

Mr. Smarty Plants thinks that your oak tree may be infested with webbing bark lice (Archipsocus nomas). Do not be alarmed. It looks rather nasty, but isn't harmful to the tree. The bark lice, which aren't really lice, are feeding on fungi, lichens and other debris on the trunk of the tree. In other words, they are cleaning your tree and, thus, are probably beneficial to it. They produce the web to protect themselves from wind, rain and predators. Here is more information Auburn University, Texas A&M and North Carolina State University. Another related species of bark iice, Cerastipsocus venosus, also commonly occurs in Texas. Here are photos of Cerastipsocus venosus. So, let them be and thank them for the cleaning service!

 

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