Clemson University - USDA Cooperative Extension Slide Series, Bugwood.org
Resistance to fungicides containing benzimidazole (FRAC Group 1) is common in greenhouses. These fungicides are unlikely to control Botrytis and are not recommended for that reason. Resistance dicarboximide fungicides (FRAC Group 2) has been found in about 50% of greenhouse operations. Do not rely entirely upon these chemicals for control.
Contact Penn State Extension to obtain information on the fungicides and biological control agents that are currently recommended for use.