1. The resistance of tomato to late blight varies from place to place. It is suggested to use one or two of dimethomorph, cymoxanil manganese zinc, propamocarb hydrochloride, metalaxyl manganese zinc, oxadiazon manganese zinc, fluazinam, oxazolidone, flumorph manganese zinc, cyazofamid, fipronamide, etc. Mixed (severe) alternate use.

(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. If the vines are in serious condition, you can apply one of the above products to the affected area at the same time and add a little water.

Prevention first, comprehensive prevention (reducing the amount of disease prevention). Use pesticide ingredients alternately, and don't use the same pesticide ingredients continuously. This is the principle of plant protection.

Second, it is suggested that difenoconazole, propiconazole, tebuconazole or fluorosilicone, prochloraz manganese salt and other triazole pesticides (the above products inhibit growth excessively),

Or difenoconazole or iprodione or pyraclostrobin or kresoxim-methyl or bromothalonil or trifloxystrobin, etc.

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.