【Hazard characteristics】Spotted diving fly is the main pest that harms the leaves of green onions. The larvae are mothed into the leaf, and the moth eats the fleshy tissue of the two layers of epidermis, showing a curved or chaotic tunnel, destroying the green tissue of the leaf and seriously affecting the growth of green onions.
【Agricultural control】Remove diseased leaf residues. During the onion growth period, it is found that the leaves that are eaten by larvae should be taken out of the field and buried deeply, and after harvest, the residues of the plants can be cleaned up and fertilized or burned, which can reduce the source of insects and turn the soil deeply, freezing the overwintering pupae in winter.
【Chemical control】Adult insects can be sprayed 1000 times a time during the peak period of Avi pyrimidine. When the amount is large, it is generally used once every 7 days. However, it is stopped 15 days before the onion harvest to prevent pesticide residues from exceeding the allowable standard;
Second, the conventional control method of "thrips" of green onion:
【Hazard characteristics】Thrips belong to the Thripsidae of the order Taemonidae. Harm shallots and other vegetables such as shallots and garlic. The worm body is small, and the adults are good at jumping. Both nymphs and adults suck the juice of the green onion leaves, and in severe cases, the wound surface forms dense gray-white spots, which shorten the life of the onion leaves and reduce the photosynthetic ability. Thrips occur for 6 to 10 generations in a year, and they are harmful from May to September, and the high temperature and dry weather in summer are seriously harmful.
【Control method】 Spray 10% imidacloprid wettable powder every 5 to 7 days every 5 to 7 days with 4.5% high-efficiency cypermethrin 1000 times liquid, spray 2 to 3 times continuously, the prevention and control effect is remarkable.
Third, the green onion "thrips, spotted fly" efficient control methods:
It is recommended to use the long-term battle "onion capacity" slow-release granule pesticide, when the green onion is transplanted, the onion granules are sprinkled in the ditch of the green onion, then the onion is planted, and finally the soil is watered; Mu dosage of 4-5 kg; Can prevent and control "thrips, spotted diving flies" for 100-120 days without spraying; And the increase in production is obvious;