Toxins of Bacillus thuringiensis var. Israelensis for Control of Malaria Vector Anopheles stephensi under Laboratory and Semi Field Conditions

Two commercial preparations of Bacillus thuringiensis var. israelensis VectoBac WDG and Mousticide WP were evaluated and compared for larval control of Anopheles stephensi a malaria vector in Pakistan under laboratory and semi field conditions. An. stephensi larvae were susceptible to VectoBac WDG and Mousticide WP but susceptibility was higher for VectoBac WDG. In semi field experiment, VectoBac WDG @ 0.4 mg/L (1X LC100) and1.6 mg/L (4X LC100) remained more effective against An. stephensi L-3 larvae up to day 7 whereas larval mortality dropped below 50% at day 14 of post VectoBac WDG application. Mousticide WP @ 1.22 mg/L (1X LC100) produced 79.33% mean mortality of An. stephensi L-3 at 1 day post treatment. The larval mortality dropped to 30% at day 14 of post treatment with Mousticide WP. No significant difference was seen in larval mortality between two dose rates of VectoBac WDG and Mousticide WP. (C) 2014 Friends Science Publishers