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棉花是我省的主要经济作物之一,常年播种面积1300万亩。1991年以来棉铃虫连续大发生,造成棉花严重减产,甚至绝收,已成为制约我省棉花生产的主要因素。1994年我们对杞县孟寨村的千亩棉花进行了技术承包,取得了理想的防治效果。防治二代棉铃虫保顶率98.5％,三代棉铃虫百株残虫4.8头,花蕾被害率5.2％,四代棉铃虫百株残虫9.1头,花蕾被害率9.8％。棉花全生育期用药12—15次,较邻近非承包区减少10次以上,平均亩防治成本40～50元,较邻近非承包区降低20—40％,现将有关技术措施总结如下。1.注意对一代棉铃虫的防治和保护自然天敌,发挥生态效应 用对天敌杀伤作用较小的抗蚜威50％可湿性粉剂3000倍液或生物制剂(Bt 200倍液,NRv800倍
Cotton is one of the main cash crops in our province, with annual planting area of 13 million mu. Cotton bollworm occurred continuously since 1991, resulting in a serious cotton yield reduction, or even absolute income, has become the main factor restricting cotton production in our province. In 1994, we carried out technical contracting on the mu cotton in Mengzhai Village, Qixian County, and achieved an ideal control effect. Prevention and control of the second generation cotton bollworm pest protection rate of 98.5%, three generations of cotton bollworm one hundred pest 4.8, bud damage rate of 5.2%, four generations of cotton bollworm one hundred insect 9.1, bud damage rate of 9.8%. The whole growth period of cotton used 12-15 times, compared with the neighboring non-contract area to reduce more than 10 times, the average mu prevention and control costs 40 to 50 yuan, 20-40% lower than the adjacent non-contract area, the relevant technical measures are summarized below. 1. Pay attention to the control and protection of natural enemies of bollworm generation one by one and exert the ecological effect with the application of 50% wettable powder or biologic agent (Bt 200 times, NR800 times