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作者应用球形芽孢杆菌Ｂｓ－９４１发泡块剂（由本所生产）和Ｂｓ－Ｆｔ发泡块剂（德国提供），在实验室和现场进行灭致乏库蚊的效果比较。室内生物测定结果显示：Ｂｓ－９４１发泡块剂ＬＤ_（６０）为０．０１９３μｇ／ｍｌ，Ｂｓ－Ｆｔ发泡块剂ＬＤ_（６０）为０．００７μｇ／ｍｌ．在３．６～４．０ｍ￣２的现孳生地水池中，两种发泡剂使用剂量为０．５，１．０和１．５ｇ／ｍ￣２，制剂４８ｈ的灭蚊效果均可达１００％，当剂量为０．５ｇ／ｍ￣２时，Ｂｓ－９４１发泡块剂持效达１７天，而Ｂｓ－Ｆｔ发泡块剂只有９天；当剂量上升到１．５ｇ／ｍ￣２时，两种发泡剂的持效均可达到２１天。对照组乳剂Ｂｓ－Ｃ_（３ｃ－４１）的浓度为０．９２μｌ／ｌ（与１．５ｇ／ｍ￣２相当）时，持效为９天，说明本所生产的Ｂｓ发泡块剂在中小型挛生地中比Ｂｓ乳剂持效长，并且超过德国Ｂｓ发泡块剂的效果和持效。
The authors used B. sphaericus Bs-941 blister (produced by our institute) and Bs-Ft blister (supplied by Germany) to compare the efficacy of Culex pipiens pallens in the laboratory and in the field. The indoor bioassay results showed that the LD_ (60) of Bs-941 foaming agent was 0.0193μg / ml, and the LD_ (60) of Bs-Ft foaming agent was 0.007μg / ml. In 3.6 ~ 4.0m ~ 2 breeding base of the pool, the two foaming agent dosage 0.5,1.0 and 1.5g / m ~ 2, the preparation of 48h anti-mosquito effects are up to 100%, when the dosage is 0.5g / m ~ 2, the Bs-941 blister lumps up to 17 days, while the Bs-Ft blister only 9 days; when the dose rose to 1.5g / m ~ 2, two kinds of foaming agent can reach 21 days persistence. The control group emulsion Bs-C_ (3c-41) concentration of 0.92μl / l (1.5g / m ~ 2 equivalent), the persistence of 9 days, indicating that the production of Bs foam block agent in In the small area, it is more effective than the Bs emulsion and exceeds the effect and persistence of the German Bs foam blocker.