Efficacy of Bioinoculants in combination with insecticides against insect pests of blackgram Vigna mungo (L.) Hepper

A study was conducted to evaluate efficacy of the bioinoculants and chemical insecticides against insect pests of blackgram Vigna mungo (L.) Hepper. Seed treatment with Beauveria bassiana + profenophos (spray) was found most effective against whiteflies (5.42 white fly/cage) and was followed by seed treatment with Beauveria bassiana + spray with Beauveria bassiana (6.27 whiteflies/cage). Similarly, in case of jassids, the seed treatment with Beauveria bassiana + profenophos (spray) registered minimal population count (1.92 jassids/cage) and was followed by combination of seed treatment with P. florescens + profenophos (spray) (2.10 jassids/cage) among the all spray. In case of thrips, combination of seed treatment with imidacloprid + profenophos (spray) gave best performance with lowest thrips infestation (2.58 thrips/10 flower) and highest reduction over control, followed by the Beauveria bassiana + profenophos (spray) 2.92 thrips/10 flower. The per cent pod damage 2.7 per cent with treatment combination Beauveria bassiana (seed treatment) + Beauveria bassiana (spray) while highest damage recorded in control plot i.e. 7.3 per cent. The Beauveria bassiana + profenophos registered highest yield i.e. 11.59 q/ha while lowest in control plot i.e. 7.98 q/ha.