Latest Diagnosis
Tree disease?
Submitted by Eric Ronk on 4/23/2014
I had someone bring in a tree branch today with what I assume is some sort of disease. He stated that several trees between his and his neighbor’s woods have this growing near the top of the branches. But he wasn’t sure what type of trees they are. Any suggestions to what this might be?

Overview of branch
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Reply by Brian D. Hudelson on 4/23/2014

Are those holes I'm seeing in the swollen areas? If so this might be insect-induced.

Brian (:))

Reply by Eric Ronk on 4/23/2014
Brian: It appears that way. He also mentioned one of the trees has a huge area near the trunk of the tree. Thought it might be some type of virus?

Reply by Patrick Liesch on 4/23/2014
I do notice a hole or two, which suggests this could be some type of gall caused by insects. Gall-forming insects tend to be pretty host-specific, so knowing the tree species would help narrow the potential list down. These galls do resemble the "gouty oak gall" which occurs on a variety of oak species. Many of these galls are caused by small wasps in the Family Cynipidae.


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