Field efficacy of a mix formulation, emamectin benzoate 0.25 + cartap hydrochloride 7.5 GR against Scirpophaga incertulas in paddy

Abstract

Comparative field efficacy of emamectin benzoate + cartap hydrochloride was judged against Scirpophaga incertulas in paddy during kharif 2017 and winter 2017-18. Seven treatments (3 different doses of emamectin benzoate + cartap hydrochloride, cartap hydrochloride, emamectin benzoate, chlorantraniliprole + thiamethoxam and untreated control) were applied to find out percent reduction of damage, yield, benefit cost ratio (B:C) and safety to natural enemies. Emamectin benzoate + cartap hydrochloride @ 9 kg/ha resulted highest reduction of dead heart (97.5%) and white ear (93.4%) over control. It was at par with 7.5 kg/ha resulting respective reduction by 96.7 and 92.8%. The highest yield measuring 44.7 and 45.4 q/ha & B:C with 10.5 and 12.8 respectively during kharif, 2017 and winter, 2017-18 were also obtained in Emamectin benzoate + cartap hydrochloride @ 9 kg/ha. Again, it was statistically at par with 7.5 kg/ha in respect to yield (43.6 and 44.7 q/ha) and B: C (11.1 and 14.3), respectively. In both doses, no detrimental effect was noticed against available natural enemies of insects. Considering highest B:C, the lower dose @ 7.5 kg/ha could be recommended for economic use in rice for effective control of S. incertulas.