Evaluation of different insecticides against rice leaffolder Cnaphalocrocis medinalis (Guenee) under field conditions

Rice leaffolder is considered as a sporadic insect pest of rice in pakistan. it can cause 30 to 40% leaf infestation and 30% yield loss. a field trial was conducted at rice research institute kala shah kaku punjab pakistan in which efficacy of certain insecticides viz.,proaxis 60cs (gammacyhalothrin) @ 75ml,karate 2.5ec ( lambda cyhalothrin) @ 200ml,padan 4g (cartaphydrochloride) @ 9kg,belt480sc (flubendiamide) @ 50ml,virtako40wg (thiamethoxam + chlorantraniliprole) @ 40gm,coragen 20cs (chlorantraniliprole) @ 50ml per acre was checked against rice leaffolder cnaphalocrocis medinalis (guenee). the experiment was laid out in rcbd with three replications. insecticides were applied at economic threshold level (etl) and observations were recorded after seven days of insecticide application. yield data was taken before harvest of rice crop. all the insecticides effectively controlled the pest and increased grain yield was achieved as compared to control. belt 480 sc with 1.12% damaged leaves was the best amongst all treatments followed by proaxis 60cs 1.28%,karate 2.5 ec 1.83%,padan 4g 2.37% virtako 40wg 2.53%,coragen 20cs 2.59% and in control 15.83% damage was observed. highest paddy yield was achieved in case of belt 480 sc 3.33 t/h followed by proaxis 60cs 3.18 t/h,karate 2.5 ec 3.01 t/h,virtako 40wg 2.87t/h,padan 4g 2.75 t/h,coragen 20cs 2.57t/h and control 2.21 t/h. all the new test insecticides proved very effective for the control of rice leaffolder. © 2014 zoological society of pakistan.