At present, it is the production season of the oil and wheat vegetables in the northern greenhouse. Downy mildew is the main disease in the production of protective vegetable oil, which occurs in general. The rate of common disease is 30% to 55%, which obviously affects the quality of the product. The rate of serious plant disease is 80% to 100%, and most of the leaves are necrotic. , significantly affecting field production. Downy mildew is seriously damaged in the adult stage, mainly affecting the leaves. The China Pesticide Network recommends comprehensive prevention and control measures based on agricultural control, especially the prevention of diseases:
Strictly carry out source control on the crops after harvesting and transplanting and planting, thoroughly remove the diseased leaves and weeds, and properly handle them. The manure must be fermented by high temperature fermentation; unified on the indoor surface, frame, aisle, noodle and The ear room and the like are disinfected, and the surface of the greenhouse can be fumigated by ozone or broad-spectrum sterilization insecticide.
Scientific field management is carried out by sorghum, high ridge or mulching, and appropriate planting. Shed management should focus on temperature control, humidity reduction and light enhancement. Small water and water poured, avoid flooding, flooding the shed to prevent leakage, and farmers with conditions should use drip irrigation as much as possible. Fertilization should prevent excessive nitrogen fertilizer, and appropriate application of phosphorus and potassium fertilizer is beneficial to enhance disease resistance and stress resistance.
When the pesticides are reasonably selected to find mild disease symptoms, if the oil and wheat vegetables are not suitable for harvesting, they should be prevented as soon as possible. In the early stage of the disease, 40% chlorothalonil or 45% chlorothalonil smoke can be used for fumigation, and 69% enoyl-manganese-zinc wettable powder, 72% cream urea·manganese-zinc wettable powder, 722 g can also be used. /Lake a mildew of hydrochloric acid saline, 250 g / liter of azoxystrobin suspension or 325 g / liter of phenyl ether azoxystrobin suspension and other agents spray, pay attention to rotation.
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