Combining effect of Enthomopathogenic fungus Beauveria bassiana, and insecticides against Chilo suppressalis in field conditions

One of the most devastating pests of rice is the lepidopteran insect striped stem borer (SSB) (Chilo suppressalis</em>) (Lepidoptera: Pyralidae). Present investigation was carried out to evaluate the relative efficacy of ecofriendly formulation of Beauveria bassiana ( 1×108 conidia/ml, Diazinon granule 15 kg/ha. and Fipronil granule 20 kg/ha.) for sustainable management of Chilo suppressalis. The fungus Beauveria bassiana is one of natural enemies of the striped stem borer, Chilo suppressalis in the rice fields. During the treatments, precent mortality, infestation of Dead heart and White heads both in vegetative and reproductive stages was observed after spray application at different times intervals i.e., 2 DAT, 7 DAT, 14 DAT and 21 DAT. All the treatments significantly reduced population of Chilo suppressalis larvae compared to control due to their mode of action. It was concluded that maximum mortality (59.29%) and (74.56%) of Chilo suppressalis were achieved with combined application fo B. bassiana both Diazinon insecticide after 21th day of application both fisrt and second generation of insect pest, respectively. In this study, The lowest infestation Dead heart and White heads 0.57 and 1%  observed in treatments Beauveria bassian and Diazinon granular after 21th day, respectively. In this research, the highest infection is created dead hearts and white heads rice was observed in the control treatment 10 and 11.67%. Therfore, the above findings showed the these combinations can be successfully can be used in rice IPM programs for Chilo suppressalis.