In July, the amount of rainfall in corn leaf blight was positively related to the incidence of leaf blight. When the diseased plant rate reached 70%, the diseased leaf rate began to develop from the bottom up; the rainfall was early and the diseased plant rate rose early. Otherwise it is late. When the diseased plant rate is 70% and the diseased leaf rate is 20%, an outbreak occurs in about 15 days after a moderate to heavy rain. When the diseased plant rate is 100% and the diseased leaf rate is 30%, it will be prevented and treated again when it encounters rainy weather. First remove 1-2 pieces of diseased leaves from the bottom of corn and destroy them; spray 50% carbendazim or 70% thiophanate 500 times, or mancozeb 800 times. Maize large spot disease selected the main cultivated varieties and the growing corn field. Five sampling points were taken to check the number of diseased plants, the number of leaves per plant and the severity of each plant. When the general disease rate reaches 100% and the diseased leaf rate is 30%, there is a rainfall process and prevention can be carried out. Can spray 12% green milk copper and so on. Select the susceptible varieties of corn round spot disease, take five sampling points, check 10 strains per point, check the diseased plant rate and the number of diseased leaves per plant. In general, it is used to control the spraying of panicles during the blooming period, with 25% triadimefon 500-800 times. Corn smut disease should be promptly cut off. Maize virus diseases include corn contraction and dwarf mosaic disease (flower mosaic streak disease). The virus is transmitted by the planthoppers and aphids. The number of field grasshoppers and aphids is closely related to the number of weeds in the field. However, the degree of poisoning of SBPH and aphids is related to the severity of wheat bush dwarf disease. Therefore, the occurrence degree of corn virus disease can be judged based on the occurrence degree of wheat bush dwarf disease. The main prevention and control is to eliminate weeds and pests to prevent serious corn virus disease. In field investigations, suspicious diseased plants were found and they should be immediately removed and sprayed with anti-virus agents, such as 5% strains of poisonous agents. The corn borer pays attention to the hatching progress of eggs and larvae damage in the field, and seizes the critical period to prevent and control the first generation of corn mash. Bt emulsion can be used to make granules or use Beauveria bassiana granules and other sprinkled into the corn big bell mouth to kill the newly hatched larvae. Corn beetles harm the corn field mainly red edge moth. The number of eggs and larvae on 100 strains was investigated in late July. When 500 eggs were found to have 2 eggs, or when the ear of the bite was more than 15%, they were immediately treated. The newly hatched larvae of the larvae have a concentrated hazard. After the corn has been larvae, the larvae have more larvae, which can be organized by artificial insecticides or by spraying.
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