Prevention and control of diseases and insect pests of edible fungi, how to control downy mildew of broccoli?

Strengthen inspection, timely spraying to control the disease, when the emergence of central disease plants or disease centers when spraying control. The medicament can choose 35% metalaxyl, 64% disinfectant alum and 58% Ruidu Manganese Zinc wettable powder 500x ~ 700x liquid, or 65.5% Pulicol water agent, 72% Kelou wettable powder 600x ~ 800x liquid, or 69% Anke Manganese Zinc + 70% Chlorothalonil (1:1) 1000 times liquid, use alternately and spray evenly.