Efficacy of some biorational insecticides against Chilo partellus (Swinhoe) in Maize

The efficacy data in terms of leaf injury, recorded at three weeks after spray, ranged from 7.6–13.3 and 4.6–11.9% in treated plots compared to 43.0 and 30.9% during 2014 and 2015, respectively. Further, deadheart incidence in the sprayed plots (1.0–3.3%) was significantly lower than in untreated control (17.1%) during 2014. Whereas, during 2015, the deadheart incidence was minimum in plots sprayed with flubendiamide 480 SC @ 50 ml/ha (1.5%) and was at par with its lower dose i.e. @ 25 ml/ha (2.6%), chlorantraniliprole 18.5 SC @ 100 ml/ha (1.6%), novaluron 10 EC @ 250 ml/ha @ (1.6%) and standard check deltamethrin 2.8 EC @ 200 ml/ha. The incidence in chlorantraniliprole 18.5 SC @ 75 ml/ha (3.8%) and novaluron 10 EC @ 187.5 ml/ha (5.9%) was moderate but significantly lower than control (19.9%). The grain yield of treated plots ranged from 56.7–62.8 and 49.6–56.3 q/ha against 49.9 & 39.4 q/ha in unsprayed plots during two years. As the grain yield in different doses of test insecticide was at par with standard check, so lower dose of insecticides, flubendiamide 480 SC @ 25 ml/ha, novaluron 10 EC @187.5 ml/ha and chlorantraniliprole 18.5 SC @ 75 ml/ha can be applied to effectively manage the pest as a component of integrated pest management.