关键词: 球形芽孢杆菌漂浮颗粒剂, 致乏库蚊, 毒杀效能

Abstract: The improvement of floating granular of B. s-C_3-41 has been conducted. Its composition consists of carriers (polyvinyl chloride particulates), adherent substance (elm bank) and B. s-C_3-41 (culture broth ). The compositive floating granular were in the radio of 2: 4: 1 (5ml) with a 10% polyvinylalcohol as chemical adherssion. The results showed that a good efficacy of floating granular against larvae of C. fatigans in the laboratory. It was causing about 90% mortality of C. fatigans larvae at 0.1473 p. p. m. AS to test on the floating granular against different instart larvae of C. fatigans. A high mortality of C. fatigans was occurring on 1-2 instart larvae. The field trial displayed that the floating granular of B. s-C_3-41 has a good efficacy to control larvae population at 0.5, 0.6 and 0.7 gm per square metre. The mortality of C. fatigans at 48 hours post-treatment were 69%, 96% and 92% respectively, and by 8-10 days activity of floating granular in puddle and ditch still producted 97.8%, 97% and 94% respectively. The persistence effect was 13-15 days.