Soft rot disease: The disease is most severe in summer, low-lying land, leggy land and successive cropping sites. The upper leaves of the disease are normal in the middle stage of disease, and all the stems and roots are rotted and odorized, which has a huge impact on the yield, and even no harvest.
Prevention measures: nurturing strong seedlings, applying basic fertilizers, and preventing and controlling underground pests in time. Rotate with corn, rice, beans.
Chemical control: spraying protection begins at the beginning of the disease. The pharmaceutical agent can be used as follows: 50% potassium citrate copper WP wettable powder 500 times, or 72% agricultural streptomycin soluble powder 4000 times liquid, as well as spray control such as chloramphenicol and kasugamycin. Spraying should focus on spraying the plant base. Every 7 to 10 days, once every 2 to 3 times, depending on the development of the disease.
Purple spot: The disease is also a long-term onset in the high temperature and rainy season. Chemical control: 58% metalaxyl manganese zinc 800 times, 50% iprodione 1500 times, 75% chlorothalonil 600 times.
Hummer: Yellow and white small spots are formed at the victim's site, and the spots are densely populated for a long time to form large patches. The leaves are yellow and wilted.
Control measures: Clear weeds in the field. When the amount is large and the soil is dry, increasing the number of irrigation can drown some of it.
Chemical control: 10% imidacloprid 2000 times or 1.8% avermectin 3000 times spray, can also use the spinosad, Kang wide, cyfluthrin and other agents to control.
Liriomyza sativae: The larvae feed on the onion leaves to form curved tunnels. Causes the leaves to dry up, or the heart leaves to rot. In the early summer and late summer, the damage was severe.
Chemical control: 75% cyromazine 5000-7000 times, or 58% abamectin diesel emulsifiable concentrate.
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