During the growth process, the green onion has white spots, dry leaves, curved atrophy and no growth, and some pesticides have no effect. How to deal with it? China Pesticide Network Xiaobian gives you the trick:
There are many pests and diseases causing dried yellow onions, such as downy mildew, gray mold, epidemic diseases, viral diseases, and breeding flies. Since the drugs for treating downy mildew, gray mold, and epidemic diseases have no effect, the green onions have viral diseases and It is most likely to be harmed by the fly, and pesticide control can be carried out according to specific symptoms.
Symptoms of the virus disease are: yellow and green mottled or yellow streaks of varying lengths on the leaves, the leaves are twisted and thinned, and the tip of the leaves is gradually yellowed. When the incidence is heavier, the growth of the green onions slows down or the whole plant is stopped. In the early stage of onion, 1.5% phytopathogenic emulsion 1000 times solution 20% morpholinium hydrochloride, copper acetate wettable powder 500 times liquid 10% mixed fatty acid emulsion 100 times liquid spray control, interval 7 to 10 days, even spray 2 ~ 3 times.
The fly is harmful: the larvae drill the roots of the onion in the underground, causing the underground part to rot and mold, the ground part is wilting, the leaf tip is yellow or the whole plant leaves turn yellow. In severe cases, the green onion stops growing or even dies. 75% of the fly amide wettable powder 3000 times solution, 40% phoxim emulsifiable concentrate 3000 times solution, 48% insecticide chlorpyrifos emulsifiable concentrate 3000 times solution, 5% hexaflumuron emulsifiable concentrate 3000 times solution to root, to control the fly larvae Worried.
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