Evaluation of new generation granular insecticides against major lepidopteran pests of rice <em>Oryza sativa</em> L.

Abstract

Field experiments were conducted during kharif season 2015-16 at Agriculture Research Station, Gangavathi. Two doses of Flubendiamide 0.7% Gr @ 70 and 85 g a.i./ha, two doses of Spinetoram 0.8% Gr @ 50 and 60 g a.i. ha-1 and standard check Cartap hydrochloride 4% Gr @ 1000 g a.i. ha-1 was tested against yellow stem borer infesting transplanted paddy. Results revealed that, flubendiamide 0.7% Gr at 100 g a.i./ha was found quite effective against YSB recording mean per cent dead heart (DH) and white ear head (WEH) of 1.59 and 1.40 respectively, followed by its next lower dose of 85 g a.i./ha (1.81 DH% and 1.96 WEH %), which was found superior to spinetoram 0.8% Gr @ 60 and 50 g a.i./ha during 2015-16. All the granular insecticides recorded the higher grain yield compared to the untreated check. However maximum yield was recorded in the treatment, flubendiamide 0.7% Gr @ 100g a.i./ha (66.29 qts/ha) and minimum yield was in untreated check plot (48.49qts/ha). Based on the evaluations it can be concluded that, the granular insecticide flubendiamide 0.7% Gr @ 85-100g a.i./ha found superior in reducing the dead heart and white ears and in obtaining higher grain yield Moreover, these new insecticide molecules are comparatively safer to non-targeted organism in comparison with other conventional insecticides.