Some newer insecticides for the management of brown planthopper (Nilaparvata lugens stal) in rice crop under eastern Uttar Pradesh conditions

Abstract

A study was conducted on the evaluation of efficacy of some newer insecticides for the ecofriendly management of brown planthopper (Nilaparvata lugens Stal) in rice crop 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 surveillance was conducted as per methodology of agroecosystem analysis (AESA) (Pontius et al., 2002) [18] modified as accessibility. The brown planthopper is an endemic insect pest of rice and accounted for 10-70% yield loss. It was observed most serious insect pest and confined infestation over 15% during the study. 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). 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 (Cartap Hcl, Imidacloprid 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. Though, both the insecticides (Imidacloprid and Neem Oil + Btk) were being most effective eco-friendly insecticides, yet Neem Oil + Btk as biorationals primarily would be the best choice before Imidacloprid for the most effective eco-friendly management of brown planthopper of rice.