"The application of insect nets to cover the cultivation of green vegetables in summer should be diluted sowing, the sowing rate from the previous 1.5 kg per mu to 0.6 to 0.75 kg per acre, 28 to 30 days as a rare vegetable market, green cabbage taste thick quality is good." Jiangsu Province Yuan Xihan, a researcher at the Vegetable Research Institute of the Chinese Academy of Agricultural Sciences, found through research that the performance of summer vegetable pest control nets covering and planting properly was relatively good. It was a major innovation in summer vegetable production.
Yuan Xihan introduced that high temperatures and rainy summers have resulted in more diseases and insect pests, which has brought certain difficulties to summer vegetable production. For species selection, varieties with good fast-growing and heat-resistance should be selected, such as the Oriental, star and other varieties cultivated by the Jiangsu Academy of Agricultural Sciences in recent years. Cultivation, the use of insect nets and shade nets covering the entire cultivation is an effective way for the production of summer vegetables without pollution, the surface of the output of the cabbage is smooth, good merchandise. Insect nets must be tightly closed and the shed doors must be closed. Otherwise, pests can easily multiply after entering the net room. Watering should be watered in the morning or evening on a sunny day. Do not flood with water. Otherwise, the humidity in the net room is too high and it is prone to diseases.
"No condition shall be adopted for the cultivation of open field summer green vegetables with pest control nets. The use of pesticides for vegetable production shall be used for the prevention and control of pests and diseases. Do not use more than twice the number of drugs for the vegetables. Do not use too much of the drug concentration. Do not use drugs within 1 week before listing." Introduction, the main pests in the production of summer vegetables are Lepidoptera pests, such as Pieris rapae and Plutella xylostella. The diseases mainly include black spot and anthracnose. Diseases can be controlled by selecting disease-resistant varieties. In terms of pest control, there are often pesticides in production. The problem of excessive concentration requires attention. The control of Pieris rapae, Plutella xylostella may use high-efficiency and low-toxicity pesticides such as Bacillus thuringiensis, trichlorfon, chlorfluazuron, chlorantraniliprole, flubendiamide, and metaflumizone.
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