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Home » Guide » Arthropods (Arthropoda) » Unidentified Tracks, Sign, and Other Mysteries » Unidentified Galls
Photo#1418337
Lost Lake leaf galls on Populus balsaminifera LL_G6 2017 1
Copyright © 2017 Tracy S. Feldman

Lost Lake leaf galls on Populus balsaminifera LL_G6 2017 1
Lost Lake Resort, Hood River County, Oregon, USA
August 4, 2017

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Lost Lake leaf galls on Populus balsaminifera LL_G6 2017 1 Lost Lake leaf galls on Populus balsaminifera LL_G6 2017 2
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Contributed by Tracy S. Feldman on 6 August, 2017 - 1:04am

Not a gall
Integral insect galls on leaves may not be very thick, but there should be some increase in thickness or some folding or some growth of concealing hairs (erineum) to provide shelter for one or more larvae.

This looks like necrotic leaf tissue. Circular leaf spots like this are often caused by a fungus or bacterium, but could also sometimes be the leaf's response to a physical stressor.
… Nancy Asquith, 7 March, 2021 - 3:26pm login or register to post comments

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