Influence of Powdery Mildew on Yield and Growth of Rosette Grapevines

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Abstract
Different levels of infection by the powdery mildew fungus Uncinula necator were established on Rosette (Vitis interspecific hybrid) grapevines growing in a vineyard at Naples, New York [USA], by delecting portions of the recommended protective spray program. Infected vines had lower pruning weights and hence lower yield. Fruit quality was reduced because of higher acidity. Wines made from infected fruit were reduced in quality. Infection also reduced the winterhardiness of canes.