Bio-efficacy of new insecticidal molecules against plant hoppers in rice crop

Abstract

The study was carried out during kharif seasons of 2020 and 2021 at different locations to assess the relative bioefficacy of new insecticidal molecules viz. Pexalon 10 SC (triflumezopyrim), Osheen 20 SG (dinotefuran), Chess 50 WG (pymetrozine) and Confidor 200 SL (imidacloprid) @ 235 ml, 500, 300 and 100 gm per hectare, respectively against plant hoppers (brown plant hopper and white backed plant hopper) in rice crop. The population of plant hoppers per hill was recorded before spray, 3, 7 and 10 days post treatment periods. It has been observed that all tested molecules are found significantly better and reduced (90.63-88.75%) the plant hoppers’ population over control. Among, insecticidal treatments Osheen 20 SG showed superiority with least plant hoppers population [(1.10, 0.55, 0.56 (av. 0.74)] per hill and it was at par with each other insecticidal molecules. The maximum grain yield (72.45 q/ha) was obtained with application of Osheen 20 SG, however the highest cost: benefit (Rs. 1: 23) was achieved with application of Confidor (100 ml/ha). It was further observed that all the tested molecules have no ill effects on spider’s population (Natural enemies).