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棉铃虫是棉花蕾铃期的主要害虫,第二、三代发生期正值棉花现蕾,开花和结铃的生殖生长阶段,一个幼虫可为害蕾和幼龄7-8个,成铃2-3个,对棉花产量和质量的影响较大。第一代均发生在棉田外,第二代棉铃虫在棉花现蕾后进入棉田危害。因此把第二代棉铃虫作为主防对象。棉田二代棉铃虫成虫(蛾)出现在7月中旬,产卵盛期出现在7月下旬、幼虫发
Cotton bollworm is the main pest in boll boll stage. The second and third generations coincided with the stage of reproductive growth of budding, flowering and boll boll in cotton. One larva could damage buds and young 7-8, A, a greater impact on cotton yield and quality. The first generation occurred in the cotton field, the second generation of cotton bollworm into the cotton fields after the cotton budding hazards. Therefore, the second generation of cotton bollworm as the main anti-object. The second generation of cotton bollworm adults (moths) appeared in mid-July, the spawning peak appeared in late July, the larvae