Resistance varies from place to place. It is suggested that one or two of dimethomorph, cymoxanil, propamocarb, metalaxyl manganese zinc, oxaprozin manganese zinc, flumorph manganese zinc, cyazofamid and fipronil be used alternately.
(If it is a protective greenhouse, pay attention to humidity control. It is recommended to use chlorothalonil aerosol to control the disease in rainy days. )
Prevention first, comprehensive prevention and control. Use pesticide ingredients alternately, and don't use the same pesticide ingredients continuously. This is the principle of plant protection.