Evaluation of insecticides against rice hispa, Dicladispa armfgera Oliver (Coleoptera : Chrysomelidae)

摘要

Rice hispa, Dicladispa armigera Olivier is emerging as a serious insect pest ofpaddy in rice growing regions of eastern India and damage by this pest has been observed 7-14 days after transplantation during wet season at Central Rice Research Institute, Cuttack. The damage symptoms by grub was more prominent towards 2nd week of August followed by increased infestation by adults towards 3rd and 4th week. Nine insecticides were tested against the pest out of which clothianidin, bifenthion, profenphos,thiomethoxam, imidacloprid and chlorantraniliprole were found effective against adult hispa. But only bifenthion, clothianidin, profenphos and thiomethoxam could reduce the the grub damage. However, clothianidin and bifenthion were most effective in controlling the adult as well as grub damage with their immediate" knock-down effect and persistent toxicity.