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生物农药—Bt若施用不当,会降低药效甚至无效。经验证明,提高Bt在药防治效果应注意把握两点: 1.掌握施药适期和喷洒浓度①主要防治对象:经济作物的棉铃虫、红铃虫、造桥虫、烟青虫等;粮食作物的二化螟、三化螟、稻苞虫、稻纵卷叶螟等;蔬菜类的菜青虫、小菜蛾、菜螟等;果树类的松毛虫、桃小食心虫、尺蠖、卷叶蛾、大袋蛾等。②防治棉铃虫的适期:于棉铃虫产卵盛期,即百株卵量达到20粒时开始施药,隔3～4天再施药1次,每代施药2～3次,大发
Biopesticides - Bt if administered improperly, will reduce the efficacy or even invalid. Experience has shown that to improve the Bt drug prevention and control effects should pay attention to two points: 1. Control of spraying and spraying the appropriate concentration of ① The main control objects: cash crop cotton bollworm, pink bollworm, bridge bugs, tobacco budworm; food crops Borer, Borer, Brachyura, Cnaphalocrocis medinalis, etc .; vegetable Pieris rapae, Plutella xylostella, cabbage moth and so on; fruit trees of Dendrolimus, Peach moth, Scylla serrata, leaf roller moth, moth and so on. ② control the appropriate duration of cotton bollworm: the bolting date of spawning, that is, when a hundred eggs reached 20 capsules, pesticide application every 3 to 4 days, each application 2 to 3 times, large hair