Effectiveness of Unsecticudes Against the Rice Leaf Folder, Cnaphalocrocis Medinalis Guenee

Nine insecticides were tested as emulsions against rice leaf folder, Cnaphalocrocis medinalis (Guenee) in greenhouse as well as in field. When insects were released on treated plants, all insecticides except oxydemeton methyl and BPMC were found effective within 24 hours registering 100% kill of the insect in green house. But when plants already infested with leaf folder larvae were treated, only ethofenprox and monocrotophos were found effe-ctive showing 100% mortality within 24 hours whereas others did not. The same two in-secticides were also equally effective in field condition with longer persistence than other insecticides.