<I>Phylloxera Galls</I> on Chestnut
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Pictured are phylloxera galls on chestnut. Insect larvae cause malformations or swellings of the leaves or twigs, known as galls.
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Other Orders of InsectsSource
L. H. Bailey Standard Cyclopedia of Horticulture (New York, New York: The MacMillan Company, 1917) volume 1, page 368
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