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nodules on the base of tree leaves?

Posted by daninthedirt 8b / HZ10 Cent. TX (My Page) on
Fri, Jun 13, 14 at 9:44

We had a storm last night, and some small branches from a next-door tree were knocked down in my yard. These branches have leaves with odd nodules at the base of many of them. See picture. What is this tree, and what are these nodules?

Ah, the nodules, when you break them open, are filled with tiny white wiggly things clinging to the inside of the cavity inside. So the nodules are caused by some invasive insect.

Follow-Up Postings:

RE: nodules on the base of tree leaves?

The structure is a gall and tree is a poplar. Possibly caused by poplar petiole gall aphid.

RE: nodules on the base of tree leaves?

Thank you. Looking up petigole gall aphids, they look exactly like what I see (in their immature phase.) I gather that somewhat later the tiny white aphids turn in to larger green bugs.

I've never seen these before on that tree. Sounds like these particular insects are stressors, but to not usually kill the tree.

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