Joint action of microbial and chemical insecticides on <i>Spodoptera litura</i> (Fab.) (Lepidoptera: noctuidae)
Keywords:
Bacillus thuringiensis, Beauveria bassiana, NPV, Spodoptera lituraAbstract
The evaluation of treatments in the control of Spodoptera litura (Fab.) on groundnut under glasshouse conditions revealed that combinations of microbial pesticides (nuclear polyhedrosis virus @ 1 x 107 PIBs ml"1, Bacillus thuringiensis subsp. kurstaki @ 1 x 10 spores ml"1 and Beauveria bassiana @ 1 x 107 spores ml"1) along with chemical insecticides (fenvelerate @ 0.005% and monocrotophos @ 0.025% i.e., half of the recommended dose) and microbial pesticides themselves were superior to either microbial pesticides or recommended rates of individual chemical insecticides alone. B. thuringiensis 1 x 107 spores ml + fenvelerate 0.005 per cent was proved as the best in respect of highest larval population reduction and lowest leaf damage (20.15 per cent). The highest pod yield (15.03 g pant"1) was recorded with the same treatment (B. thuringiensis 1 x 107 spores ml"1 + fenvelerate 0.005 percent).Downloads
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