The main diseases and pests of autumn vegetables tend to occur

Due to the continuous low temperature and rain in early spring, the prevalence of vegetable diseases and pests in the early stage generally occurred, and the number of field pests was high. In the near future, it will gradually enter the stage of sowing and nursery of autumn vegetables. There are many types of vegetables, various cultivation methods, and many bridge hosts, which are conducive to the occurrence of diseases and insect pests. In addition, the current temperature is still high, and the weather conditions are conducive to fungal diseases and the development of whiteflies. On the whole, the major pests and diseases of vegetables in autumn in Jiangsu Province this year tend to show a heavy tendency. Among them, Bemisia tabaci, Spodoptera littoralis, Ladybird 28, Ladybug, Downy Mildew, and Botrytis cinerea occur heavily; , Plutella xylostella, Pieris rapae, and yellow-fleshed swiftlet occurred moderately; Tomato yellow leaf curl virus transmitted by B. tabaci may be more likely to occur in the old circumvallation zone of coastal autumn pepper; mild powdery mildew occurred.
Vegetable pest control should be based on agricultural measures, using high-efficiency and low-toxicity agents for control. At present, most of the vegetables are in the harvesting stage, and the diseased bodies should be collected outside the field; the sowing date should be properly adjusted. The time of autumn tomato breeding should be kept away from the peak period of adults of B. tabaci, and the occurrence of tomato yellow leaf curl virus disease should be controlled. To reduce the temperature and humidity, reduce the incidence of diseases. In order to prevent the occurrence of seedling diseases, soil treatment can be performed with carbendazim, sodium propionate and other drugs before sowing or sowing. If disease occurs in the adult plant, the pesticide should be used in the early stage of the disease, powdery mildew should be treated with triadimefon or difenoconazole, and bacterial keratopathies should be treated with 77% copper hydroxide wettable powder to prevent and treat viral diseases. With Ning Nanmycin, Phytopathogenic 1.5% alkanol sulfate copper water emulsion control, downy mildew with chlorothalonil and metalaxyl mixed control. For B. tabaci, based on measures such as adjusting slaughter period to avoid pests, planting onions and other non-hobbying hosts, and removing old and middle leaves, etc., cover insecticide net nursery, hunt yellow plates for trapping, and use pymetrozine and azide. Insect amines, buprofezin and other drugs control. To prevent and control pests such as Spodoptera exigua, Spodoptera litura and other pests, it is necessary to use biological pesticides such as Bacillus thuringiensis, granulosis virus, and polyhedral virus in the control of young larvae. When the population density is high, tebufenozide, chlorfluazuron, and hexaflumuron can be used. , chlorfenapyr and other chemical agents control.

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