New research findings on the control of grapevine powdery mildew

First Paragraph: Because of the apparent non-effectiveness of Bayleton to control powdery mildew on grapevine in 1985 and 1986, research was initiated to investigate the problem. Isolate of Uncinula necator were collected from problem vineyards in several grape-production areas and were used in greenhouse and laboratory tests to study factors involved in disease control and Bayleton use.