The corn borer is an important pest in the seedling stage of corn, and often causes damage to the corn production point. The plants are dwarfed, the leaves are chlorotic, and the crops are tillered. The farmers call it "Kidzulan Miao." The damage of corn borer has been aggravated in recent years. In 2004, the number of affected plants in individual severe plots reached 60%-80%, which should be highly valued. 1. Symptoms and Characteristics of Infestation Maize mainly suffers from seedling stage, that is, from the end of May to the beginning of June, the corn borer starts to invade the base or junction of the root of the 2-3 cm root near the surface. The boring hole has a nearly circular or elongated rift and is brown. The harmful pathogens in the soil can easily infect plants from the pod borehole. The middle and upper leaves gradually appeared yellow-green stripes, and the damage to the growing points caused dwarfing of the plants, and the leaves were clustered with clivia. The investigation found that yellow-green stripe symptoms began to appear on 8-10 days after the damage of corn borers, and the duration of yellow-green stripes and the degree of dwarfing of plants were closely related to the age of the leaves when the maize was damaged. In the 6-8 leaf stage of the maize, the damage was heavy. In severe cases, individual leaves faltered or appeared rows of holes, and the heart was wilted. The field symptoms of corn borer plants are similar to those of maize virus disease and zinc deficiency disease. Attention should be paid to the difference. The main difference is that brown boreholes or cracks are left on the roots of corn after the damage by the borer. In general, corn borer damage is caused by multiple ridges, and the plant is strong. When the plant shows obvious symptoms, the insect has been damaged and it is difficult to find worms. Low-lying land, sandy land, late-planting field, and multi-year re-rotation farms are heavy. There are certain differences in the degree of damage among different varieties of corn, and the reasons for this need to be further studied. 2. Prevention and cure method 1 Rotate the crops to avoid heavy crops. 2 Remove field weeds. In the previous year, severely pested land could be combined with soil preparation to treat the roots of corn roots and reduce the number of insects. 3 Chemical control can be treated with 40% Dimethoate 500 times solution at the initial stage of damage.
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