Efficacy of different bio-fertilizers and bio-pesticides against pod bug in green gram

Abstract

od bug is an important hemipteran pest of green gram which not only damages the pod but also reduces the yield of the crop. Field studies on the crop green gram were conducted during the pre-Kharif season in 2013–2014 at the agricultural farm of Palli Siksha Bhavana (Institute of Agriculture), Visva-Bharati, Birbhum, West Bengal. Studies were made to find out the effect of different bio-fertilizers and bio-pesticides against the incidence of pod bug. The bug incidence gradually increased towards reproductive stage of the crop. It was found that variety V1 (VP1) showed highest pod bug incidence followed by V2 (SML-668) and V3 (Samrat). It was found that V3 (Samrat) resulted in lower incidence of pod bug as compared to others. All bio-fertilizer-treated plots showed significant differences in bug incidence as compared to bio-fertilizer-untreated plots. Among all the tested bio-pesticide combinations of Beauveria bassiana and Verticillium lecanii (15 g/3 l) gave better results against the bug. During the study combination of Metarrhizium anisopliae and V lecanii (15 g/3 l) and V lecanii and neem combinations at same dose were found moderately effective. The highest efficacy over control was recorded in imidachloprid (61.76%) followed by combination of B bassiana and V lecanii (42.64%).

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