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Laboratory bioassay was carried with five different concentrations of Beauveria bassiana (1x104 to 1x 108 ml-1) against the pulse beetle, Callosobruchus maculatus. Stored seeds were severely attacked by the pulse beetle, Callosobruchus maculatus, a coleopteran pest.At the larval stage, it penetrated into stored seeds and fed on cotyledons. Entomopathogenic fungus, Beauveria bassiana caused maximum oviposition reduction and 100% adult mortality was obtained at higher concentrations. Mortality declined with the decrease in concentrations. At higher concentrations, oviposition reduction was 60.58%, and adult mortality was 99.44% at 92h respectively. It showed higher virulence compared to other isolates.At lower concentrations, oviposition reduction was 23.82% and adult mortality was 81.93% at 92 h respectively.
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