According to the recent forecast by the National Agricultural Technology Service Center for Diseases and Insects and Diseases, this year's disease and insect pests in the middle and later stages of the year have been heavily harmed. The degree of occurrence is heavier than usual, and the pests are heavier than last year. From mid-August to early September, they are corn earworms. During the period of great harm, we hope that the majority of farmers will increase their vigilance and take preventive measures.
The earworms that damage corn include cotton bollworm, corn borer, stickworm, peach aphid, sorghum strips, and autumn caterpillars. With the increase of planting cornices in recent years, the intercropping and intercropping area has provided favorable conditions for corn earworms and the formation of panicles is concentrated, which has a great impact on the yield and quality of corn. In general, the occurrence of corn earworm has two major hazards: First, early plots of spit silk and scattered cultivation of the crop, corn ear pests are more serious; while the evening of silking and contiguous plots are less harmful. The second is that corn earworms are mainly cotton bollworms and corn borers.
The best period of prevention and control of corn earworms is when the filaments of the ear begin to wilt and corn pollination is finished. Prevention and treatment will affect the corn pollination prematurely; prevention and treatment are too late, pests have penetrated into the ear, and the control effect is poor. Prevention and control of corn earworms should be integrated prevention and control: 1 cut off filaments. After the corn is finished, the scissors are used to cut off the filaments together with the 1-2 cm of the top of the ear of the ear with scissors, and all the cut materials are brought out of the field for centralized treatment to prevent pests from being transferred. 2 Pesticide control. When pests in the field range from 25% to 30% or 100 insects to 40, insecticides are immediately used. Can choose 2.5% Lambda-cyhalothrin EC 1500 times or 4.5% Beta-cypermethrin EC 1500 times to align the spicule and spray; Also use 3% phoxim granules 400-500g for dry fine 5-6 kilograms of sandy soil, sprinkled between the leaves and leaves of the upper and lower leaves of the filaments and ears. 3 manual capture. When the age of pests is large, the effect of drug control is poor or the standards for drug prevention cannot be achieved, artificial capture can be carried out.
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