Figure 2

Cumulative proportional survival of Anopheles stephensi exposed to spores of B. bassiana or the pyrethroid insecticide lambda-cyhalothrin applied to clay tiles. Control tiles were left untreated. The chemical pesticide was dropped from assessments after month 3 as it was not achieving the specified mortality level. Exposures were carried out monthly after an initial post application assessment (Day 1) for five months. Blue, red and orange curves show survival for the control, pyrethroid and B. bassiana treatments respectively. The dotted orange curve in the Month 5 figure shows survival of An. stephensi which were exposed every three days to the B. bassiana treated clay tiles (see main text for further details).