Vol. 13, Issue 4 (2024)

Experiment under glass house was conducted to evaluate the bio-efficacy of various entomofungus biopesticides against brown planthopper (BPH), To assess efficacy of insecticides and biopesticides, the treatments were diluted to specified doses with water and sprayed on 30-day old potted TN1 rice plants with the help of fine atomizer, where 2nd and 3rd instar nymphs of BPH were released on to each treated plant. Observations on BPH mortality were recorded at 1st,2nd,3rd, and 4th week after spraying. The results revealed that all the treatments were found to be significantly superior over untreated control (plain water). After the 1st week of treatment, plants treated with Dinotefuran @20% SG showed significant reduction whereas there was a negligible reduction in nymph population of the plants that were treated with biopesticides. Dinotefuran

@20% SG, was found to be most effective in comparison to all other treatments where it showed the reduction percentage of 58%. At the end of 4th week, it was noted that among the entomofungal biopesticides the most effective treatment registered was Metarhizium anisopliae followed by Beauveria bassiana, Nomuraea rileyi, Lecanicilium lecanii and Fusarium equiseti where they suppressed the population by about 14-24%.