Corn Ear and Pest Damage Characteristics and Prevention Measures
From mid-August to early September, it is the earliest period of corn ear damage. The pests that damage the ear of corn include corn borer, armyworm, white-spotted golden turtle, fall caterpillar, etc., which have a great influence on the yield and quality of corn.
Hazardous characteristics: Firstly, due to the difference in the silking stage of corn and planting plots, the degree of hazards varies greatly. Early and scattered plots of spit silk are much heavier than plots of late and contiguous plots. In the same year, early and scattered plots of corn were planted on silk plots, and the rate of maize ear pests was as high as 60%-80%; The rate is generally 10% -30%. Second, corn earworms and insect pests are dominated by corn borers, accounting for 80% to 90%, and the remaining pests only account for 10% to 20%. Grasp the characteristics of the occurrence and damage of corn ear pests and take effective preventive measures.
Prevention and control measures: Prevention and treatment at the peak of silking of the ear will affect pollination of the corn; if the control is too late, the pest has penetrated into the ear, resulting in difficulties in control and prevention and control. Changzhi County is the main period of flowering and pollination of maize in the middle and late July. It is necessary to seize the best prevention and control period and implement comprehensive prevention and control: 1. After cutting off the silk corn, timely use scissors to cut the filaments together with the top of the ear 1-2 centimeters. The leaves were cut off and all the sheared things were brought out of the field to be treated centrally to prevent the pest from being transferred. 2. Pesticide control When 100 insects reach 40 heads, pesticides are immediately used to prevent and control. 80% of dichlorvos EC 800 times can be used, and cotton buds are used to spread the spicules; or 2.5% deltamethrin EC 200- 300 drops into the top of the ear, with 6-10 drops per ear or 1500 times 2.5% lambda-cyhalothrin EC, or 1500 times 4.5% beta-cypermethrin EC. Mu with 3% phoxim granules 400-500 grams, against dry sand 5-6 kilograms, sprinkled in the filaments and leaves of the upper and lower leaves of the leaves. 3. Manual capture When pests have a large age, poor drug control, or fail to meet anti-drug standards, manual capture can be performed.
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