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棉铃虫是棉花铃蕾期一种主要害虫,棉株受害后造成早期(雨季前)蕾铃脱落现象,使成铃率大减,严重影响棉花产量。根据历年调查,常年被害率在30—50%,蕾铃损失率在30%左右,同时由于虫粪污秽和由虫孔灌进雨水,引起棉铃的腐烂,棉絮变黄,降低棉花品质。因此,在深翻、多肥、密植等高产栽培条件下和减低了苗期病虫害的基础上,采用综合防治措施消灭棉铃虫为害,就成为减少雨季前蕾铃脱落,确保棉花大丰收的关键之一。
Cotton bollworm is one of the main pests in boll bud stage. After the cotton plant is damaged, it causes early (pre-rainy season) shedding of buds, causing a significant decrease in boll rate and seriously affecting the yield of cotton. According to the survey over the years, perennial victims of the rate of 30-50%, the loss rate of bolls about 30%, at the same time due to insect manure contamination and irrigation by the wormhole, causing cotton boll rot, cotton yellow, reducing cotton quality. Therefore, on the basis of high-yield cultivation such as deep plowing, multi-fertilizer and close planting, and reducing pests and diseases at the seedling stage, the comprehensive prevention and control measures to eliminate the damage of the cotton bollworm become the key to reducing the fall-off of the pre-rainlear and ensuring the cotton bumper harvest one.