Bioefficacy of some botanical and chemical insecticides against yellow stem borer Scirpophaga incertulas (Walk.) In rice field at Jharkhand

Abstract

Field experiments were conducted at Rice research farm of Birsa Agricultural University, RAC (Ranchi Agriculture College) Kanke, Ranchi to find effectiveness of different insecticides against stem borer in aromatic rice during Kharif season of 2016. Relative efficacy of four botanical insecticides i.e. NSKE 5% @25 kg/ha, Pongamia oil (@ 3 lit/ha, Nimbolin 0.15% Aza. (@ 3 lit/ha and Neembaan 0.15% Aza. (@ 3 lit/ha and one chemical control Acephate 75SP @ 650 g/ha were tested along with untreated control in rice. All the insecticidal treatments were significantly superior to untreated control. Acephate 75SP @ 650 g/ha was found most promising with minimum dead heart and white ear incidence. The data on dead heart and white ear incidence, grain yield showed that all the insecticides effectively control the stem borer on aromatic rice revealed that four foliar spray of acephate 75SP @ 650 g/ha applied at 25, 50, 75 and 100 DAT proved to be the most effective in causing maximum reduction in the incidence of stem borer, resulting in the highest grain yield of 37.80 q/ha with maximum net profit of Rs. 45,138/ha with BC ratio of 10.7:1.