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Grape phylloxera (Daktulosphaira vitifoliae) is an aphid-like insect that forms galls on leaves and roots of grapevines. Leaf galls are small, spherical growths on the underside of the leaf. Phylloxera feeding on roots results in galls on apical rootlets and older root portions. Serious infestations can result in premature defoliation, reduced crop yield and quality, and eventually vine death. Infested vines can be pulled, destroyed, and replaced with resistant varieties. There are currently no chemical controls registered for home use against the grape phylloxera.
Plant and Pest Digital Library and Digitally Assisted Diagnosis, Purdue University, West Lafayette, Indiana.