Abstract
Laboratory bioassays of two development stages, blastospores (BS) and conidiospores (CS) of Beauveria bassiana (strain GK 2016) against Aedes aegypti larvae were conducted at 27°C. In Study 1, against 24 h post-hatched larvae, both BS and CS stages showed significant difference in their respective larvicidal efficacy over the control ( P < 0.0001). Larval mortality between 24 and 96 h post-exposure was significantly higher than any other time period investigated. Significantly higher larval mortality was observed with BS or CS at 10 8 ml −1 over lower concentrations ( P < 0.05). In Study 2, against different age groups, 12–24 h post-hatched larvae showed significantly higher mortality when treated with BS or CS than older age groups ( P < 0.05). A significant difference was found in the larvicidal potency of B. bassiana at different fungal stages.
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