OWRI: Powdery Mildew

Dr. Michelle Moyer, Assistant Professor & Extension Viticulturist; Washington State University Department of Viticulture and Enology

Powdery mildew remains a concern for grape growers and can be difficult manage. Populations of Erysiphe necator cleistothecia can burst open and release ascospores over an extended period of time ranging from fall through late spring. These ascospores are an important source of primary inoculum for grapevine powdery mildew epidemics. Dr. Moyer will discuss the role of primary inoculum in grape powdery mildew epidemics; focusing on the biology of inoculum arrival, and how weather and management choices influence subsequent epidemic development.

To view live online, see link above. Live chat will NOT be available, however, online live participants can submit questions during the seminar to danielle.gabriel@oregonstate.edu, and they will be answered at the end.