Recently, there are many kinds of onion farmers friends asked how green onion "white crazy" how to treat, in fact, farmers' friends said "white crazy" caused by three reasons, that is, one disease two insects.
1. Gray mold. Gray and white spots appear on the leaves, and then develop into white necrotic spots. The ellipses are nearly shuttle-shaped, and multiple lesions connect into slices causing the leaves to twist and die. Chemical control It is recommended to use an all-new type of fungicide Enzymes 1000 times spray to prevent and control the spread of the disease.
2. Hummer. Its adults and nymphs suck in onions with blunt suction mouthparts, causing the onion to form many long-shaped yellow and white markings. When severe, the onion leaves are distorted and brown. Chemical control can be controlled by spraying with 20% acetamiprid 3000 times solution or 10% imidacloprid 1500 times solution.
3. Leaf leaf fly. After hatching, the larvae eat leafy meat in the leaves, forming a gray-white pelicans stalk. The snorkeling is irregular and widens with the age of the larvae. The larvae are able to move forward and backward within the tunnel in the leaf tissue, inside and outside the leaf cylinder. When migrating to the victim's site, when there is a plurality of insect tracks on a tube, the subducts collude with each other. In severe cases, they can spread throughout the leaves, resulting in yellow leaves. The agent can be sprayed with 2% avermectin 1000 times solution.
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