苏芸金杆菌微胶囊剂型与标准菌粉灭蚊幼效果比较

COMPARISON OF MOSQUITO LARVICIDAL EFFICACY BETWEEN MICROBIAL ENCAPSULATED BTI (EBTI) AND STANDARD BTI (SBTI)

本文报道按美国哈佛大学专利技术制备的苏芸金杆菌微胶囊剂型(EBTI)与标准菌粉剂(SBTI)灭蚊幼效果比较。结果表明:1 在BTI为0.007～0.002ppm低浓度时,EBTI灭蚊幼持效显著高于SBTI(P<0.01),在施用后第4wk仍保持100％的蚊幼死亡率;而相同浓度的SBTI组在施用第2wk后,蚊幼死亡率逐周下降,显著低于EBTI组(P<0.01),至第4wk灭蚊幼效力消失。表明EBTI比相同浓度SBTI持效长、毒效高。2 趋势性假设检验结果示SBTI在BTI浓度≤0.025ppm时,蚊幼死亡率随用药时间延长而呈下降趋势(X^2=8.17～24.08,P<0.01);而EBTI组在BTI浓度为0.025～0.007ppm时,蚊幼死亡率保持100％,表明EBTI最适长效高效低剂量BTI血浓度为0.007ppm。

A comparative study was conducted on the efficacy of mosquito larvicides EBTI and SETI.The results showed that: 1.The residual efficacy of EBTI was remarkably higher than that of SBTI at 0.007-0.002ppm BTI concentration (P<0.01),the mosquito larvae mortality of EBTI remained 100% until the 4th week; in contrast,the mosquito larva mortality of SBTI gradually and obviously declined from the 2nd to 4th week after treatment (x2=8.17-24.08),and reached 0 at the 4th week.2.The lowest BTI concentration of EBTI at which a high efficacy persisted for 4 weeks was 0,007ppm BTI,the mosquito larva mortality remaining 100%.