Evaluation of some newer ecofriendly insecticides against major insect pests of rice under eastern Uttar Pradesh conditions

Abstract

An evaluation was conducted on the efficacy of some newer ecofriendly insecticides against major insect pests of rice under Eastern Uttar Pradesh conditions for the two consecutive years (2014 and 2015) at farmer field of district Deoria. This evaluation was observed most effective ecofriendly insecticides concerned to lowest infestation, lowest P:D ratio, and highest yield. There were 10 treatments (09 insecticides + 01 check) evaluated under randomized block design (RBD) by transplanting method of rice cultivation on localized popular rice cultivar Samba Mahsuri. The insecticide treatments comprise 9 insecticides (Cartap Hcl, 50 SP, Indoxacarb 14.5 SC, Imidacloprid 17.8 SL, Chlorpyriphos 20 EC, Thiamethoxam 25 WG, Chlorantraniliprole 18.5 SC, Azadirachtin (Neem Oil) 0.03 EC, Bacillus thuringiensis kurstaki (Btk) 3.5 WP, and combination of Neem Oil 0.03 EC + Btk 3.5 WP). The infestations of major insect pests of rice were observed for most serious insect pests, which were 1.Yellow stemborer (Scirpophaga incertulus Walker), 2.Common rice leaffolder (Cnaphalocrosis medinalis Guenee), 3.Brown planthopper (Nilaparvata lugens Stal), 4.Rice hispa (Dicladispa armigera Oliver), and 5.Rice earhead bug (Leptocorisa acuta Thunberg). There were 3 insecticides (Imidacloprid, Cartap Hcl, and Neem Oil + Btk) inference non-significant for lowest infestation; 2 insecticides (Neem Oil + Btk and Imidacloprid) inference non-significant for lowest P:D ratio; 3 insecticides (Imidacloprid, Cartap Hcl, and Neem Oil + Btk) inference non-significant for highest yield. There were 2 insecticides (Imidacloprid and Neem Oil + Btk) inference most effective eco-friendly insecticides for major insect pests of rice. Though, both the insecticides (Imidacloprid and Neem Oil + Btk) were being most effective ecofriendly insecticides, yet Neem Oil + Btk as biopesticides primarily would be the best choice before Imidacloprid for the most effective ecofriendly management of major insect pests of rice.