Efficacy of some insecticides against major insect pests of rice, Oryza sativa L.

The present experiment in field condition was carried out to assess the relative efficacy of some newer insecticides with some conventional insecticides against major insect pests of rice during kharif 2013-14. The treatments include: T1- Acephate 95 SG @ 682 g a.i /ha; T2-Rynaxypyr 20 SC @ 30 g a.i/ha; T3- Dinotefuran 20 SG @ 40 g a.i /ha; T4- Cartap hydrochloride 50 WP @ 375 g a.i/ha; T5- Fipronil 5 SC @ 75 g a.i/ha; T6- Thiamethoxam 25 WG @ 37.50 g a.i /ha; T7-Buprofezin25 SC @ 250 g a.i /ha; T8- Lamda cyhalothrin 5 EC @ 30 g a.i /ha; T9-untreated control. The overall data reveals that the Rynaxypyr 20 SC @ 30 g a.i/ha treated plot recorded significantly lower per-cent of dead heart (0.42%) and white ear- head (1.24%) caused by stem borer and higher grain yield than the other treatments. Thiamethoxam 25 WG @ 37.50 g a.i /ha treated plot recorded significantly higher % reduction of hoppers (>60% over untreated control) and Fipronil 5 SC @ 75 g a.i/ha treated plot had lower number of silver shoot (2.6%) incidence. Among the different treatments the maximum numbers of spiders were found in Rynaxypyr 20 SC @ 30 g a.i/ha treated plot followed by other treatments.