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通过对苏云金芽胞杆菌发酵后处理工艺的改进，运用超滤及喷雾干燥技术获得新型高效价粉剂．室内生物测定结果表明，该粉剂的杀虫效果为目前工厂常规产品的１０倍左右．同时，以ＣＳ－１９９１（Ｈ３ａｂ）作为标准品，３龄小菜蛾为供试虫，对其进行了毒力效价测定，测定的高效价粉剂死亡机率值与质量浓度对数值的回归方程为ｙ＝３．９３＋１．２６ｘ（ｒ＝０．９８），ＬＣ５０＝６．９８ｍｇＬ－１，效价为４７６１９．０８ＩＵｍｇ－１
Through the improvement of Bacillus thuringiensis fermentation treatment process, the use of ultrafiltration and spray drying technology to obtain a new high-potency powder. Indoor bioassay results show that the insecticidal effect of the powder plant is about 10 times the conventional products. At the same time, CS-1991 (H3ab) was used as the standard and the 3rd instar Plutella xylostella was tested for its virulence. The regression equation of the probability value of high-potency powder mortality and the value of mass concentration was y = 3.93 + 1.26x (r = 0.98), LC50 = 6.98 mgL-1, titer 47619.08IUmg-1