Comparative efficacy of some granular insecticides against maize stem borer, Chilo partellus (Swinhoe) under high efficiency irrigation system

Maize crop is being attacked by numerous insect pests including borers which result in yield losses. Repeated use of similar insecticides resulted in resistance development in maize stem borer. The current research trial was executed to find out the lethal impacts of Chlorantraniliprole 0.4% G, Carbofuran 3 G, Fipronil 0.3% G, Cartap hydrochloride 4%G, Thimet and Monomehypo against Chilo partellus (S.). Results of insect pest infestation showed that maximum infestation (25.87%) was noted in check plot whereas lowest (2.93%) was recorded in case of Chlorantraniliprole 0.4% G, Carbofuran 3 G was the next effective one (6.17%) followed by Fipronil 0.3% G (8.44%), Cartap hydrochloride 4%G (12.02%), Monomihypo (13.98%) and Thimet 5%G (15.08%). In case of dead-heart production, maximum dead heart (20.41%) were observed in control plot while lowermost (1.26%) in Chlorantraniliprole 0.4% G treated plot. Highest reduction in plant infestation (88.69%) over control was noticed in case of Chlorantraniliprole 0.4% G followed by Carbofuran 3 G (76.13%), Fipronil 0.3% G (67.38%), Cartap hydrochloride 4%G (53.50%), Monomihypo (46.18%) and Thimet 5%G (41.72%). In case of months of the study, maximum infestation (%) was noted during the month of August compared to July and September. Crop water productivity was highest (2.58 kg/m3) in the case of Chlorantraniliprole 0.4% G treated plots, while a comparatively low (1.29 kg m-3) was noted in the case of Thimat 5% treated plots under drip irrigation system but was superior to control plot (1.29 kg m-3) under flood irrigation system Overall results disclosed that all the insecticidal treatments sustained their supremacy over check plot in reducing infestation of C. partellus and Chlorantraniliprole 0.4% G was the best among the tested insecticides against C. partellus.