| Summary: | AbstractThe Yellow Stem Borer (YSB), Scirpophaga incertulas Walker, (Lepidoptera: Crambidae) is a devastating pest that significantly affects the yield of spring rice crops. Insecticides have been the primary method used to control YSB, but comparative efficacy studies of different insecticides against YSB in Nepalese rice production systems are limited. This study aimed to investigate the efficacy of seven insecticide treatments against YSB on the Hardinath-1 variety of rice during the period of February to June 2022. A Randomized Complete Block Design was employed, and the efficacy of the treatments against YSB was evaluated by monitoring the mean values of dead hearts and white heads, recorded at different intervals of post-treatment. The results showed that Chlorantraniliprole 18.5SC (0.4 ml/l) and Chlorpyriphos 20EC (2.0 ml/l) were the most effective treatments, as they outperformed all other treatments, not only in terms of controlling dead heart and white head but also in their effect on yield. The yield of rice plants treated with Chlorantraniliprole 18.5 SC and Chlorpyriphos 20 EC was 3.31 t/ha and 3.24 t/ha, respectively. These results suggest that the application of these two insecticides can provide effective control against YSB and protect rice plants from damage caused by dead heart and white head. However, despite the positive results obtained in this study, it is important to note that the efficacy of the tested insecticides needs to be tested on a larger scale, as well as in different ecological regions.
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