1) These experiments were couducted to compare the effectiveness of with several new insccticides for the control of the rsce stem borer at Kimhae and Suwon in Korea from 1962 to 1963. 2) Gam ma-dol dusf and gramular were applied on the water surbul by hand and the other insecticides were sprayed on the leves of the paddy rice plaut by knap sack spayer(Table 1). 3) Gamma-dol was for the control of rice stem borers. more effective than other insecticidesused. timing for the applioation of$gamma-dol$ was 10 days before hatching from the eggs. 4) There were no any significant differences in the effect of$gamma-dol$ to the rice stem borer in both areas of Kimhae and Suwon.