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稻苞虫已上升为我县水稻上的主要害虫。近年来,连年发生,危害日趋严重。为了选择无公害、无残毒又能有力控制危害的新剂型,去年我们对生物农药B_t乳剂与常用化学农药防治稻苞虫作了对比试验。试验选择在长势浓绿,虫口密度较高的稻田内。小区随机区组排列、重复三次。供试农药:苏云金杆菌B_t乳剂(湖北农科院微生物厂产品);90％晶体敌百虫(陕西大荔农药厂产品);80％敌敌畏(兰化公司盐锅峡化工厂产品)。供试品种:汕优63。处理项目:B_t乳剂亩用3两、4两、5两,敌百虫亩用3两,敌敌畏亩用2两和
Rice shell insects have risen to the main pests on rice in our county. In recent years, successive years, the harm has become increasingly serious. In order to choose a new formulation that is pollution-free, non-toxic and powerful to control the damage, last year we compared the biopesticide B_t emulsion with the commonly used chemical pesticides for the control of rice stemworm. Test options in the dark green, insect population density higher rice fields. District random block arrangement, repeated three times. Test pesticides: Bacillus thuringiensis B_t emulsion (Hubei Academy of Agricultural Sciences microbial products); 90% crystal trichlorfon (Shaanxi Dali Pesticide Factory products); 80% dichlorvos (Lanhua company Salt Lake Gorge chemical products). Test varieties: Shanyou 63. Treatment items: B_t emulsion mu 3 two, four two, five two, trichlorfon mu with two two, dichlorvos mu with two two and