Grape phylloxera (Daktulosphaira vitifoliae Fitch) can be found on roots of Vitis labrusca and V. riparia native to the eastern US and V. vinifera, the European grape. Vitis labrusca cultivars are thought to tolerate root feeding without substantial damage. On the other hand, root feeding on V. vinifera causes direct damage and in addition, necrosis by secondary soil-borne pathogens. The damage caused by the pathogens may greatly exceed the direct injury due to feeding by phylloxera on V. vinifera. Therefore, we hypothesized that the tolerance of V. labrusca is in large part due to resistance to the secondary pathogens. We determined susceptibility data from V. labrusca cultivars in New York and California, and wild V. riparia grapevines found in New York.
Species 1: Vitaceae Vitis labrusca (Grapevine)
Species 2: Homoptera Phylloxeridae Daktulosphaira vitifoliae (Grape phylloxera)
Keywords: grapevine roots, soilborne pathogens
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Back to The 2002 ESA Annual Meeting and Exhibition