EARLY BOTRYTIS ROT OF GRAPES AND ITS CONTROL

Name: WINERY MARKETING COMMITTEE MEETING
Start: 2026-02-04T09:00:00-08:00
End: 2026-02-04T11:00:00-08:00
Location: Lodi Wine Visitor Center

First Paragraph: Early Botrytis rot of grapes is a new development in an old disease caused by Botrytis cinerea Pers. It is characterized by a brown rot of part of or most all grapes in a cluster from midseason to harvest in the absence of rain. Infection occurs through the stigmatic end of the flower at bloom time. There the fungus becomes latent until midseason or later, when it resumes growth and rots the grapes. Effective control was obtained with benomyl applied as a water spray (1 lb 50% active/acre) or as a dust (15 lb of 10 % dust/acre).