Insect Galls on Trees and Shrubs
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Galls are distinctive swellings or abnormal growths of plant tissue caused by an attack of a living organism. Insects, mites, nematodes, bacteria, fungi, and viruses can trigger these plant deformities. Galls can also form as a result of mechanical injury. This publication deals only with tree and shrub galls caused by insects and mites.
Shour, Mark; Iles, Laura J.; and Lewis, Donald R., "Insect Galls on Trees and Shrubs" (2018). Extension and Outreach Publications. 336.
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