摘要
A comparative study was conducted on the efficacy of mosquito larvicides between nucrobialencapsulated BTI (EBTI) and standard BTI (SBTI).The results showed that:(1) The residual efficacyof EBTI was remarkably higher than that of SBTI at 0.007-0.002×10^(-9)/L BTI concentration(P<0.01),the mosquito larva mortality of EBTI remained 100% until the 4th week, in contrast, the mosquito larvamortality 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 efficacypersisted for 4 weeks was 0.007×10^(-9)g/L BTI, the mosquito larva mortality remaining 100%.
A comparative study was conducted on the efficacy of mosquito larvicides between nucrobialencapsulated BTI (EBTI) and standard BTI (SBTI).The results showed that:(1) The residual efficacyof EBTI was remarkably higher than that of SBTI at 0.007-0.002×10^(-9)/L BTI concentration(P<0.01),the mosquito larva mortality of EBTI remained 100% until the 4th week, in contrast, the mosquito larvamortality 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 efficacypersisted for 4 weeks was 0.007×10^(-9)g/L BTI, the mosquito larva mortality remaining 100%.
