COMPARATIVE TOXICITY OF SOME INSECTICIDES AGAINST RICE LEAF FOLDER (Cnaphalorosis medinalis) UNDER FIELD SITUATIONS

Abstract

against Cnaphalorosis medinalis. Four synthetic insecticides were applied with three replicates at recommended dose rates. Toxicity trials were performed under RCBD. The results of the toxicity experiments disclosed the lowest mean leaf reduction damage (6.84%) after 14 days of 2nd spray by application of Flubendamide followed by Emmamectin Benzoate (15.03%). The damage was reduced 17.21-17.00% in case of Fibronil and 17.19-16.12% by Lambda cyhalothrin but was superior to untreated plots. The results of 1st spray revealed that the lowest mean leaf damage (12.24%) was noted in case of Flubendamide application among the tested insecticides. In case of yield analysis, the highest percent grain filling (92.34%) was examined in Belt insecticide trailed by Timer (87.12%), whereas the lowest (70.46%) was noted in case of control. Increase in yield (%) disclosed that the highest increase in yield (21.54%) was recorded in application of Belt insecticide, while relatively the lowest (10.23%) was observed in Boxer insecticide. Overall, the results depicted that the longest exposure period proved more effective as relative high reduction in leaf damage, and Flubendamide was the most effective among the all tested insecticides. Hence, this insecticide can be used in Intergrated Pest Management Program (IPM) for the successful management of C. medinalis. Keywords: Oryza sativa, insect pests, IPM, pest scouting, toxicity bioassays, efficacy.