Powdery mildew remains a concern for grape growers and can be difficult to 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 discussed 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.

Date: March 8, 2016
Title: Powdery Mildew: Biology and Management
Presenter: Dr. Michelle Moyer, Assistant Professor & Extension Viticulturist; Washington State University Department of Viticulture and Enology