Chives in the summer and autumn high temperature and humidity of the rainy season, epidemic epidemic of epidemic chives easily, can make the original green onions become macular in 2-3 days, then turn white, onion leaves covet, or even rot, causing Serious loss. Chives attack mainly onions and pedicels. In the early stages of onion disease, green and white inconspicuous spots appeared, which became greyish white spots and spread longitudinally along the onion leaves. They quickly became long white spots with a width that was more than half of the circumference of the onion tube and even greater; it caused the onion leaves to weigh less and wither; When the rain is heavy or the humidity is high, the disease minister produces white cotton hairy mildew; when the weather is dry, the white shape disappears, but the tearing sick leaves still have cotton wool-like white mycelia on the inside of the onion tube. The disease is caused by a fungus called Phytophthora infestans. It is a virulent infectious disease with strong pathogenicity. The pathogens spore or mycelia overwinter in the diseased body. In the warm winter, the germs can be infected for an annual anniversary. Can also be accompanied by germs. The pathogenic spores can be transmitted by wind and rain. The spores germinate and produce germ tubes. They penetrate the onion epidermis and directly invade the host. The onion swiftly develops under high temperature and high humidity conditions, and spores develop rapidly in the lesions. Infection, expanding damage, 25-32 °C is most suitable for onset. High temperature, high humidity and rainy weather, the disease is most popular; planting density, low-lying field water is conducive to disease; excessive application of fertilizer, nitrogen fertilizer is more emphasis on disease when the disease is more severe. Prevention of chives disease first requires that the planting sites be well drained, sorghum and deep trenches be settling, rainwater should be drained in time to reduce the humidity in the field; thoroughly remove the sick plants in the field and implement non-onion and garlic vegetable rotation; use reasonable formula fertilization to increase phosphorus and potassium fertilizers and trace elements Fertilizer, avoid partial nitrogen fertilizer. The use of plant ash also helps to increase resistance to disease. Once the epidemic has been discovered, we must seize the time immediately and use the following agents to spray and control: Rinosaur (60% Dimethomorph Morpho Manganese Zinc WP) 800-1000 times, Tianke Manganese Zinc (60% wettable powder) 700-800 times , Dew-speed net (72% wettable powder) 1000-1200 times, Kamyco (64% wettable powder) 700-800 times, Ruiduxue (58% wettable powder) 500-600 times, preferably per Spray once every 7 days for 2-3 consecutive times. In addition, Baikening (40% suspension), aluminum phosphonium manganese zinc (70% wettable powder), Jiadaning and other agents have a better control effect on the disease.
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