Plant Galls

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Most plant galls are caused by mites and wasps, but a few galls are caused by midges, psyllids, aphids, and beetles.
Wool sewer gall on oak Mite galls on black cherry
Photograph ofwool sewer gall by Eric R. Day, Virginia Polytechnic Institute and State University, www.insectimages.org and
mite-caused galls on black cherry by Andrew J. Boone, South Carolina Forestry Commission, www.insectimages.org
Leaf curl midge damage Oak-apple gall on oak
Photograph of leaf curl midge damage by James Solomon, USDA Forest Service, www.insectimages.org and
photograph and thumbnail of oak-apple gall by James Solomon, USDA Forest Service, www.insectimages.org
Tulip gall midge on tulip poplar leaf

Photograph of tulip gall midge damage on tulip poplar leaf by Lance S. Risley, William Paterson University, www.insectimages.org