目的：观察苏云金杆菌以色列变种漂浮块剂的稳定性及防制蚊幼虫效果。方法：生物测定及小型滋生地现场试验。结果：该块剂在水中可持续漂浮１４天，且不出现松散现象。其对致倦库蚊的ＬＤ５０为０．４２７８ｍｇ／ｍｌ；现场试验结果显示：在３．４ｍ２水池中，用５、１０、２０ｇ／ｍ２剂量，２４小时时致倦库蚊幼虫下降率分别为９４．５％、９１．８％和１００％，持效分别为１１、１３、１７天。相同剂量２４小时白纹伊蚊幼虫死亡率均为１００％，持效分别为６、８、１２天 OBJECTIVE: To observe the stability of Bacillus thuringiensis isolates and their control effects against mosquito larvae. Methods: Bioassays and small-scale breeding ground trials. Results: The block survived water flooding for 14 days without loosening. The LD50 of Culex pipiens quinquefasciatus was 0.4278mg / ml. The field test results showed that in the 3.4m2 ponds, the decay rates of Culex pipiens pallens larvae were 94% and 94% respectively at 5, 10 and 20g / m2 .5%, 91.8% and 100%, respectively, for the effective duration of 11, 13, 17 days. The mortality of Aedes albopictus larvae at the same dose for 24 hours was 100%, and the persistence rates were 6, 8 and 12 days