author(s)
Gadepally Vinay Reddy and Ashwani Kumar

abstract
The present studies on the Efficacy of various insecticides against maize stem borer Chilo partellus (Swinhoe) and their cost-benefit analysis at Prayagraj were conducted during field experiment which is laid-out in randomized block design with three replications at research field of the department of Entomology, Sam Higginbottom University of Agriculture, Technology and Sciences, during the Kharif season of 2019-2020. Comparing with seven treatments along with control plot reveals that all the chemical treatments were significantly superior over control. Among all the treatments lowest percent infestation of maize stem borer and mean percent reduction was recorded in Carbofuran 3G (9.09%) (60.28%) and followed by Cypermethrin 25 EC (10.1%) (55.87%), followed by Imidacloprid 200SL (11.1%) (51.46%), and Bifenthrin 10 EC (11.78%) (48.53%), then followed by Novaluron 10 EC (12.45%) (45.60%) and the remaining treatment, Cartap hydrochloride 50% SP (14.14%) (38.22%) and Deltamethrin 2.8 EC (15.15%) (33.81%) are the remaining treatments which are least effective against control of maize stem borer. The yield obtained and B:C analysis shows that the yields among the treatment were significant. The highest yield was recorded in Carbofuran 3G (39 q/ha) with B:C ratio (1:2.20) Which is superior to all other treatments. Next is Cypermethrin 25 EC recorded (36.44 q/ha) with B:C ratio (1:2.01), then followed by Imidacloprid 200 SL (33.89q/ha) with B:C ratio (1:1.89), then followed by Bifenthrin 10 EC recorded yield (32.4 q/ha) with B:C ratio (1:1.63) and the yield recorded by other treatments are Novaluron 10 EC (30.12 q/ha) with B:C ratio (1:1.63), then followed by Cartap Hydrochloride 50% SP (27.83 q/ha) with B:C ratio (1:1.1.52), then followed by Deltamethrin 2.8 EC (24.42 q/ha) with B:C ratio (1:1.3) is the least yield plot among the chemical treatment plot.