Evaluation of some insecticide modules against major insect pests and their natural enemies in rice, Oryza sativa L.

During present studies nine insecticides modules were assessed against major pests of rice and their natural enemies. Amongst them eight modules consist of a basal application of chlorantraniliprole 0.4 G @ 40 g a.i./ha at 20 DAT and third application of flonicamid 50 WG @ 75 g a.i./ha at 65 DAT and module ten was untreated control. Whereas module nine consist of a basal application of cartap hydrochloride 4G @ 600 g a.i./ha at 20 DAT followed by acephate 75 SP @ 658 g a.i./ha at 50 DAT and third application dinotefuran 20 SG @ 40 g a.i./ha at 65 DAT which was taken as farmers practice. All first eight insecticide modules differed with each other only second treatment which was applied at 50 DAT. The second treatments included: acephate 95 SG @ 682 g a.i./ha; cartap hydrochloride 50 WP @ 375 g a.i./ha; rynaxypyr 20 SC @ 30 g a.i./ha; fipronil 5 SC @ 75 g a.i./ha; spinetoram 6% + methoxyfenozide 30% SC @ 135 g a.i./ha; flubendamide 48 SC @ 48 g a.i./ha; azadirachtin 0.03 EC @ 8 g a.i./ha and chlorantraniliprole 0.4 G @ 40 g a.i./ha. The overall data revealed that all the treated plots recorded significantly lower per cent of dead heart, white ear-head caused by stem borer and plant hoppers respectively. Module with rynaxypyr 20 SC @ 30 g a.i./ha or spinetoram 6 + methoxyfenozide 30 SC @ 135 g a.i./ha treated plot recorded significantly higher % reduction of stem borer infestation and gave higher grain yield (5.26 t/ha and 5.15 t/ha respectively) than the other modules. Module with fipronil 5 SC @ 75 g a.i./ha recorded significantly lower number of plant hoppers than other modules. Among the different treated modules, the maximum numbers of spiders and mirid bugs were found in rynaxypyr 20 SC @ 30 g a.i./ha and azadirachtin 0.03 EC @ 8 g a.i./ha containing modules.