PERFORMANCE OF DIFFERENT RICE CULTIVARS AND INSECTICIDES AGAINST Tryporyza incertulas (WALKER) AND Cnaphalocrocis medinalis (GUENEE)

Studies were conducted to determine the toxicity of roll up (7.2% g), furadan (3g), solomon (300-0-teq), belt (48% sc), karuz (4% gr) and shark super (6% g) and relative resistance of rice varieties irri-6, ksk-282, dr-83, basmati-370, basmati-385 and super basmati against rice stem borer and rice leaf folder and their effect on yield ha^-1. roll up and shark super ranked first in their efficacy against rice stem borer; as 0.64% and 0.63% dead hearts and 0.32 and 0.33% white heads were recorded, respectively, and which were significantly (p < 0.05) lower than control. solomon with 0.73% infestation was the most effective insecticide against rice leaf folder. rice varieties irri-6 and ksk-282 were the most resistant varieties against rice stem borer; as 14.73% and 18.34% dead hearts, and 4.33% and 4.77% white heads were significantly (p < 0.05) lower than the other tested varieties. similarly irri-6, ksk-282 and dr-83 also showed resistance to rice leaf folder. basmati-385 was the most susceptible variety against rice leaf folder. ksk-282 with 5656 kg ha^-1 yield ranked first. plots treated with shark super resulted in to highest (7014 kg ha-1) yield whereas; plots treated with karuz resulted into lowest (5984 kg ha^-1) yield.