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Addressing the Gaps in our Knowledge of Grapevine Downy Mildew for Improved Forecasting and Management

M. M. Kennelly, D. M. Gadoury, W. F. Wilcox, P. A. Magarey, and R. C. Seem

July 2007

Review

The complex interactions of Plasmopara viticola with environment and host make grapevine downy mildew an ideal candidate for disease forecasting. However, a forecasting model is only as good as the knowledge used to build it, and DMCast is no exception. We addressed some knowledge gaps concerning this disease: (i) initial timing and span of primary infection; (ii) survival of the lesions and sporangia; and (iii) critical period of fruit susceptibility.

doi:10.1094/PHP-2007-0726-03-RV

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