Biorational management of stem borer, Chilo partellus in maize

A field experiment was conducted during kharif season of 2017-18 at Central Research Field, Department of Entomology, SHUATS, Allahabad, (U.P) to study the evaluate the efficacy of some insecticides and biopesticides, against stem borer (Chilo partellus) on maize under field condition. Application of the seven treatments Cypermethrin, Chlorpyrifos, Dimethoate, Azadirachtin, NSKE, Beauveria bassiana (108 CFU/ml) and Bacillus thuringiensis reduced the infestation as compared to the untreated control. The minimum percent of infestation were observed in Cypermethrin (10.31%), then followed by Chlorpyrifos (11.7%), Dimethoate (11.7%) which is reported as the next effective treatment. Out of seven different insecticides Cypermethrin recorded significantly highest yield of 41.23 q/ha followed by Chlorpyrifos (36.54 q/ha). The cost benefit ratio (CBR) showed that the application of Cypermethrin 25% EC was economically most viable treatment (1:1.64) followed by Chlorpyrifos (1:1.42).