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United States Department of Agriculture

Agricultural Research Service

Research Project: EXOTIC, EMERGING, RE-EMERGING, AND INVASIVE PLANT DISEASES OF HORTICULTURAL CROPS

Location: Horticultural Crops Research

Title: Inoculum detection for managing grape powdery mildew

Authors
item Mahaffee, Walter
item Grove, Gary -
item Stoll, Rob -

Submitted to: Practical Winery and Vineyards
Publication Type: Popular Publication
Publication Acceptance Date: March 12, 2011
Publication Date: May 1, 2011
Citation: Mahaffee, W.F., Grove, G., Stoll, R. 2011. Inoculum detection for managing grape powdery mildew. Practical Winery and Vineyards. Spring. p. 26-32.

Technical Abstract: Grape powdery mildew (caused by Erysiphe necator) often develops explosively and can result in significant yield and quality losses, despite your best efforts. The threat of quality losses often leads to a low risk prophylactic regimen rather than a higher risk IPM approach. Gary Grove and I have come to realize that you do not always have to spray when you think you do. Erysiphe necator inoculum was demonstrated to not always be present in a vineyard, and methods were developed to determine when it is present. These methods were then shown to be effective for initiating fungicide applications when E. necator is detected in the vineyard air. The applications resulted in 2.4 fewer fungicide applications without reducing disease control.

Last Modified: 9/22/2014
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