Study on Control Techniques of Downy Mildew in Oily Wheat Germ

1. Source control must be strict. After the crops are harvested and before transplanting and planting, the diseased leaves and weeds shall be thoroughly removed and properly treated. The manure must be sterilized by high-temperature fermentation; the surfaces, shelves, aisles, sculls and ear chambers of the shed shall be uniformly disinfected. For treatment, the surface of the greenhouse can be fumigated with ozone or a broad-spectrum bactericide.

2. The field management should be appropriate. Transplanting in time to avoid excessive seedling age; using high hoe, high ridge or mulching film cultivation, appropriate thinning. Shelter management should focus on controlling temperature difference, dehumidifying humidity and increasing light. Small water pouring, avoid flooding irrigation, rainy days, pay attention to greenhouse leak-proof, conditional farmers as far as possible drip irrigation. Fertilizer to prevent excessive nitrogen fertilizer, adequate application of phosphorus and potassium fertilizer.

3. Scientific medicine should be timely. When mild disease symptoms are found, if oil and wheat vegetables are not suitable for harvesting, they should be prevented and treated as soon as possible. At the beginning of the disease, 40% chlorothalonil smoke agent or 45% chlorothalonil aerosol can be used for smoke control. 69% methacrylamide zinc WP, 72% urea manganese zinc wettable powder, 722 g/L can also be used. Propionic acid hydrochloride, 250 g/l azoxystrobin suspension, or 325 g/l paraben acetochlor suspension. Pharmacy should pay attention to rotation, the harvest period and the last application period must be greater than the safety interval.

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