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Pathogenicity of Beauveria bassiana and laboratory assessment with selective pesticides

S. M. Bisandre^a, Y. V. Ingle^b,*, G. K. Lande^c, M. D. Giri^d

 
ABSTRACT:      Beauveria bassiana is one of the most promising entomopathogenic fungus species utilized for pest control. The pathogenicity of B. bassiana was tested by spraying spore suspension directly on third instar larvae of Helicoverpa armigera. The highest larval mortality (80.00%) was achieved by application of spore load of 1011 conidia/ml. It is needed to determine the effects of pesticides on B. bassiana as it is to be included in a pest management program. The compatibility of fungi with selected pesticides commonly used in plant protection was investigated in this study. Nine different insecticides were evaluated at two different doses (recommended dose and half of recommended dose) under in vitro condition against B. bassiana by poison food technique. Fipronil and spiromesifen significantly supported the maximum growth (4.03 and 3.85 cm, respectively) of B. bassiana at half of recommended dose, while the remaining insecticides appeared to be toxic to the tested fungus. Ten different fungicides were also tested in vitro against B. bassiana at half and recommended doses; potassium phosphonate supported maximum radial mycelial growth of 2.98 cm (at half of recommended dose) and 2.36 cm (at recommended dose), whereas carbendazim + mancozeb and fluxapyroxad + pyraclostrobin appeared harmful by restricting the growth of the B. bassiana at both doses. This study demonstrated the varying pesticide effects on fungi; however, their actual effects at the cellular and field levels must be investigated to determine whether the effects are permanent or temporary.

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* Corresponding author, E-mail: yvingle@pdkv.ac.i

Received 13 Mar 2022, Accepted 29 Jun 2022