nodules on the base of tree leaves?

daninthedirt(Cent TX; HZ10, Sunset z30, USDA z8a)June 13, 2014

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.

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lycopus(z5 NY)

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

    Bookmark   June 13, 2014 at 10:02AM
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daninthedirt(Cent TX; HZ10, Sunset z30, USDA z8a)

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.

    Bookmark   June 13, 2014 at 10:22AM
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