Management of sesame leaf webber and capsule borer (Antigastra catalaunalis Dup.) in Meghalaya

Abstract

Field experiment was carried out at Entomology Research Farm, ICAR Research Complex for NEH Region, Umiam, Meghalaya to evaluate some bio and chemical pesticides against sesame leaf webber and capsule borer during kharif season of 2022.The experiment was laid out in randomized block design (RBD) with three replications. Sesame (Var: Nagaland Local) was sown in 12 m2 areas with 45 cm x 15 cm spacing. Eight treatments viz. T1-neem oil 0.03% (5ml/l), T2-Beauveria bassiana (5ml/l), T3-Bacillus thuringiensis (Bt) var kurstaki (2ml/l), T4-spinosad 45% SC (0.5ml/l), T5-Bacillus thuringiensis (Bt) var kurstaki + Saccharopolyspora spinosa 15% (2 ml/l), T6-emamectin benzoate 5% SG (0.4g/l), T7-imidacloprid 17.8SL (0.3ml/l) and T8-control were applied at 45, 60 and 75 days after sowing. Observation on leaf webber and capsule borer larvae was recorded one day before spray and 7 and 14 days after each spray. The pooled results showed that all the treatments were effective against sesame leaf webber and capsule borer and showed significant difference among the treatments. Among the treatments, emamectin benzoate 5SG @0.4g/l recorded the lowest mean population and the highest reduction over control (1.72 larvae/5plants and 72.32%, respectively) followed by spinosad 45 SC @0.5 ml/l (2.11 larvae/5plants and 66.07% reduction), Bt var kurstaki + Saccharopolyspora spinosa 15% @2.0 ml/l (2.44 larvae/5plants and 60.71% reduction), [email protected] ml/l (3.06 larvae/5plants and 5.89% reduction), neem oil 0.03% @5.0 ml/l (3.61 larvae/5plants and 41.96% reduction). The highest yield (7.22 q/ha) was recorded from emamectin benzoate 5SG @0.4 g/l treated plot followed by Bt var kurstaki + Saccharopolyspora spinosa 15% @ 2ml/l (7.04q/ha) and spinosad 45SC @0.5ml/l (6.94q/ha). The lowest yield was found in control plot (5.28 q/ha).