Junagadh Agricultural University, India
Mitul Karkar is a plant biologist and has been working on Biopesticide, fungus, larva. He works as a assistant professor at Junagadh Agricultural University, India, His area of research work mainly focused on the biopesticides in agriculture.
Investigations on "bio- efficacy of Beauveria bassiana (Balsamo) Vuillemin against Helicoverpa armigera (Hubner) infesting pigeonpea" were carried out at the Agronomy farm and Department of Entomology, College of Agriculture, Junagadh Agricultural University, Junagadh, Gujarat during kharif 2011.
The study revealed that the treatments of polytrin-C 0.044 per cent, chlorpyriphos 0.05 per cent and acephate 0.15 per cent were found the most toxic to the H. armigera larvae. The next best treatments were Bb @1.25 kg/ha + polytrin-C 0.022 per cent and Bb @1.25 kg/ha + chlorpyriphos 0.025 per cent. The bio-pesticide B. bassiana alone showed the toxicity from 3rd day of application and increased drastically in subsequent period up to 15th day of application and found more or less compatible with either insecticides.
The B. bassiana @ 3.5 g/litre proved to be the most effective dose among five doses tested against 3rd instar larvae of H. armigera under laboratory condition.
Laboratory investigation on compatibility of B. bassiana fungus with different seven insecticides revealed that the insecticides spinosad, indoxacarb, monocrotophos and acephate were most compatible with entomogenous fungus, B. bassiana. Chlorpyriphos, polytrin- C and azadirachtin were found less compatible with entomogenous fungus, B. bassiana.