Ukrainian vegetables are also known as collapsed vegetables, collapsed vegetables, collapsed earthworms, and black vegetables. It is mainly distributed in the Yangtze River basin. Currently, it is cultivated in most parts of the country, and some places are introduced as special vegetables. Because of the rich nutrition, it is favored by people. The disease and insect pests of the saplings have also occurred from time to time, resulting in reduced yield and reduced quality. Timely pesticide control is necessary. The China Pesticide Network Xiaobian gives you advice on the prevention and control of common pests and diseases of U.
The common diseases of U. sinensis are viral diseases, downy mildew, soft rot, and pests such as aphids and cabbage caterpillars. The principle of pest control is “mainly prevention, comprehensive prevention and controlâ€. From the beginning of emergence, the fungicides and insecticides are used alternately every 7 to 10 days, so that “the insects are not seen, and the disease is not seenâ€.
1. Viral disease: Under the conditions of continuous high temperature, drought and aphid, the disease is heavy and spreads quickly. To prevent and control aphids in time, use 20% virus A wettable powder 500 times solution, 1.5% phytopathogenic emulsion 1000 times solution at the beginning of the disease, spray once every 7 to 10 days, and even spray 2 to 3 times.
2, downy mildew: the leaves first appear chlorotic spots, then brown to pale yellow, and then necrosis. At the time of onset, 72% gram of dew 600 times solution, 58% of metalaxyl manganese cadmium 500 times solution, 70% of mancozeb 500 times solution, 25% toxic mycelium 1000 times solution, alternating spray control, once a week .
3, soft rot: timely elimination of pests, to prevent biting plants, cultivating and other operations to avoid damage to plants to reduce the invasion of disease from the wound. Pesticide control can be controlled by 72% agricultural streptomycin, neomycin or chloramphenicol 100 ~ 200mg / kg, spray 60kg per acre.
4, cabbage caterpillar: avoid continuous cropping with cruciferous vegetables, timely clean up the pastoral, reduce the source of insects. Biological control with Bt emulsion 800 ~ 1000 times liquid spray control. The chemical control can be controlled by spraying 2.5% kungfu 3000 times liquid, or 90% Wanling 2000 times liquid, or spraying with 10% quenching emulsifiable concentrate 6000-8000 times.
5, mites: clean up the field and surrounding weeds, pesticide manufacturers recommend the use of 50% anti-Pu Wei WP 2000-3000 times liquid or 10% imidacloprid WP 2000 times liquid spray prevention.
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