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Home » Guide » Arthropods (Arthropoda) » Unidentified Tracks, Sign, and Other Mysteries » Unidentified Galls » Gall-like Structures Not Covered By BugGuide
Photo#355756
galls
Copyright © 2009 barefootheart

galls
ganaoque, frontenac arch, marble rock trail, Ontario, Canada
November 29, 2009
Size: 3 to 9 inches
One tree was riddled with these large masses. I thought they might be some sort of gall. A few other trees in the area had a small number as well.

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galls galls
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Contributed by barefootheart on 1 December, 2009 - 10:16am
Last updated 16 December, 2009 - 9:20am

Fungus
On page 149 of Diseases of Trees and Shrubs, by Sinclair & Lyon (2005), there is a photo of identical galls on hickory attributed to a fungus called Phomopsis.
… Charley Eiseman, 27 July, 2010 - 5:54am login or register to post comments

Moved
Moved from ID Request.
… Charley Eiseman, 16 December, 2009 - 9:20am login or register to post comments

Host plant?
It's important to note the plant species when trying to identify galls (the stripey bark suggests some kind of hickory to me, or maybe Amelanchier, but I'm not sure). These particular ones, though, look like they are caused by something other than an arthropod--fungus, virus, or environmental stress.
… Charley Eiseman, 1 December, 2009 - 10:28am login or register to post comments

 
Agree with hickory
This look like a young hickory tree to me: striped bark, thick twigs.
… John Pearson, 12 January, 2010 - 8:36pm login or register to post comments

 
galls
I wasn't sure what the tree was, but the forest mostly featured oak, maple, beech and shagbark hickory. There was a branch that looked like it had broken off lying on the ground. The galls on it have small holes, like something had drilled out of them, I thought. See second photo.
… barefootheart, 1 December, 2009 - 10:36am login or register to post comments

 
holes
They could be holes made by a beetle or other insect that feeds on the fungus that causes the galls, if they are fungus-caused. I've seen similar holes in woody galls that I know were caused by a fungus--the "black knot" that deforms cherry and related trees.
… Charley Eiseman, 1 December, 2009 - 10:39am login or register to post comments

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