In the case of corn borers, the sap of plant sap is sucked by the nymphs, and the locusts in the seedling stage are clustered in the heart and leaves. When the crop is seriously affected, the growth and development are poor and even death. In addition to sucking sap, ear mites also secrete a lot of honeydew to form a layer of black mold on the foliage, affecting photosynthesis, and spreading corn dwarf mosaic virus, causing dwarf mosaic disease.
Control methods: (1) Biological control: When maize has a large number of grasshoppers, ladybugs, food flies, and grasshoppers at the seedling stage, try to avoid chemical control or use pesticides that are harmless to natural enemies. (II) Chemical control: In the area where the thorns were serious or the corn dwarf mosaic disease was serious, the early stage of corn heading survey was conducted. When the number of 100 corn stubble reached 4,000, and the percentage of the stubble plants was more than 50%, the pesticide should be promptly administered. Prevention. The agent may use 2.5% deltamethrin emulsifiable concentrate 3000 to 3500 times solution, or 50% anti-inferiority WP 2000 times solution, or 50% neoprene wettable powder 8 to 10 g per mu or 10% imidacloprid wettable Powder 10 to 15 grams per acre water 45 kg spray control.
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