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棉铃虫是棉花的主要害虫,幼虫咬尖蛀蕾,一般年减产10～15％,严重年减产20％以上。前几年由于单一使用菊酯类农药,使棉铃虫产生了较强的抗药性,增加了用药次数和用药量。为解决这一问题,根据四代棉铃虫70％的幼虫集中在夏玉米雌穗危害的规律。采取剪除苞叶尖以压低虫源基数的方法,取得很好的效果。其技术要点如下: 1、剪苞叶尖的时间。一般在8月23～28日。
Cotton bollworm is the main pest of cotton, larvae bite sharp buds, the general annual reduction of 10 to 15%, a serious annual reduction of more than 20%. A few years ago due to a single use of pyrethroid pesticides, cotton bollworm produced a strong resistance, an increase of the number and dosage of medication. To solve this problem, according to the fourth generation of cotton bollworm 70% of the larvae concentrated in the law of the summer corn ear damage. Take the method of cutting the tip of the husk to lower the base of the insect and achieve good results. The technical points are as follows: 1, cut the tip of the bud time. Usually in August 23 ~ 28.