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斜纹夜蛾、甜菜夜蛾是江苏省秋季蔬菜、大豆、花生等多种作物生产上的重要害虫,寄主范围广、食性杂,危害作物种类多。9月上中旬将进入两种夜蛾类害虫低龄幼虫高峰期,正是防治的有利时期,错过防治适期后大龄幼虫抗药性强,防治难度大。各地要根据虫情,对十字花科蔬菜、芋头、豆类、花生等高虫量田块,及时组织开展防治。
诱杀成虫利用性诱剂和杀虫灯诱杀成虫。
农业防治根据初孵幼虫群集危害的特性,结合农事操作,及时摘除初孵虫卵叶、捏杀卵块和虫窝,降低田间害虫发生数量。
药剂防治于卵孵高峰至1~2龄幼虫盛期防治,间隔5~7天再用药1次;防治药剂可选用短稳杆菌、苏云金杆菌、斜纹夜蛾核型多角体病毒、甜菜夜蛾核型多角体病毒、氯虫苯甲酰胺、虫螨腈、虫酰肼、茚虫威等药剂。
注意事项夜蛾类幼虫有昼伏夜出的习性,宜在傍晚喷药,喷药时要将叶片正反面喷到,同时对植株根际附近地面也要喷透,以防滚落地面或钻入土表层的幼虫漏治。注意药剂交替使用,防止害虫产生抗药性。苏保
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