Studies on Granular Insecticides Against Yellow Stem Borer, Scirpophaga Incertulas (Walker) and Leaf Folder, Cnaphalocrocis Medinalis (Guenee) in Basmati Rice

Abstract

The present investigation carried out at Crop Research Center, Chirori, Sardar Vallabhbhai Patel University of Agriculture and Technology, Meerut -250110 (U.P.), India in order to evaluate the different insecticides against yellow stem borer and leaf folder in basmati rice. The infestation of S. incertulas and C. medinalis was recorded one day before application, seven, fourteen and twenty-one days after first and second application. The infestation of S. incertulas was recorded lowest in the plot treated with Virtako 0.5% w/w GR @6 kg/ha is (3.05% DH) and (2.45% WEH) followed by Ferterra 0.4% w/w GR @10 kg/ha (3.45% DH) and (2.80% WEH), Cartap hydrochloride 4% GR @18 kg/ha (4.03% DH) and (3.40% WEH), Cartap hydrochloride 50 SP @1 kg/ha (4.50% DH) and (3.90% WEH), Fipronil 0.6% w/w GR @15 kg/ha (4.90% DH) and (4.40% WEH) and Thiamethoxam (0.9%) + Fipronil (0.2%) GR @12 kg/ha (5.26% DH) and (4.80% WEH), respectively. The infestation of C. medinalis was recorded lowest as 3.10 and 2.20 per cent in the plot treated with Ferterra 0.4% w/w GR @10 kg/ha after first and second application followed by Virtako 0.5% w/w GR @6 kg/ha 3.35 and 2.35, Cartap hydrochloride 50 SP @1 kg/ha 4.05 and 2.95, Fipronil 0.6% w/w GR @15 kg/ha 4.30 and 3.60, Cartap hydrochloride 4% GR @18 kg/ha 4.48 and 3.85 and Thiamethoxam (0.9%) + Fipronil (0.2%) GR @12 kg/ha 4.73 and 4.40 per cent, respectively. Among all the treatments Ferterra 0.4% w/w GR @10 kg/ha was found safer with maximum mean population of spiders after first (2.70) and second (2.30) application followed by Cartap hydrochloride 4% GR @18 kg/ha 2.58 and 2.24, Fipronil 0.6% w/w GR @15 kg/ha 2.38 and 2.10, Thiamethoxam (0.9%) + Fipronil (0.2%) GR @12 kg/ha 1.95 and 2.0, Virtako 0.5% w/w GR @6 kg/ha 1.30 and 1.12 and Cartap hydrochloride 50 SP @1 kg/ha 1.24 and 0.98, respectively. Virtako 0.5% w/w GR @6 kg/ha treated plots gave maximum yield (47.80 q/ha), net profit (Rs 20284/ha) and highest cost benefit ratio (1: 5.55) and followed by Ferterra 0.4% w/w GR @10 kg/ha, yield (47.20 q/ha), net profit (Rs 17970/ha) and cost benefit ratio (1:4.40), and all other treatments. But Virtako 0.5% w/w GR @ 6 kg/ha shows the superiority in incremental cost-benefit ratio than Ferterra 0.4% w/w GR @10 kg/h.