Botrytis bunch rot of grape was significantly reduced by canopy management in this study. Integrating leaf removal with chemical control may reduce the need for multiple fungicide applications.

This research was supported in part by a grant from the University of California IPM Program. The authors thank Wente Bros., Arroyo Seco Vineyards, Monterey County, and Robert Mondavi Vineyards, Napa County, for their cooperation in field trials.