Efficacy of chlorpyriphos 75wdg against rice stem borer, Scirpophaga incertulas walker. (Lepidoptera: Pyralidae)

Abstract

The experiment was conducted to study the efficacy of Chlorpyriphos 75 WDG against rice stem borer, Scirpophaga incertulas Walker. The research work was carried out during Rabi 2014 - 15 on the rice field of Mr. Kamal Murarkar, village Morabe, Tal. Karjat, Dist. Raigad (M.S.). Experiment consisted of eight treatments and three replications. Two rounds of sprays were done. Observations on per cent dead hearts were recorded at 7 and 14 days after each application. It was observed that per cent dead hearts decreased with increase in concentration of each insecticide. The results revealed that 7 days after first and second spraying, treatment T3, Chlorpyriphos 75 WDG @533g/ha was found effective and at par with the treatment T2, Chlorpyriphos 75 WDG @500g/ha and were significantly superior over all other treatments. Maximum yield was also obtained from the treatment T3, Chlorpyriphos 75 WDG @533g/ha (51.90 q/ha) and at par with the treatment T2, Chlorpyriphos 75 WDG @500g/ha (50.70 q/ha).