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Laboratory bioassay studies were carried with six different concentrations of Beauveria bassiana (Bals.) Vuill., Metarhizium anisopliae (Metsch.) Sorokin., Verticillium lecanii (Zimm.) Viegas., Hirsutella thompsonii (Fisher) and Cladosporium oxysporum (Berk. and Curt.) against the adults of Aphis craccivora. In the high concentration (108 spores ml-1) 100% mortality was obtained with V. lecanii and H. thompsonii followed by B. bassiana, M. anisopliae and C. oxysporum. Mortality declined with the decrease in concentrations. The lowest LC50 value of 2.5x104 spores ml-1 was recorded by V. lecanii and H. thompsonii isolates, which showed higher virulence compared to other isolates. The LC50 values of B. bassiana, M. anisopliae and C. oxysporum were 4.5x104, 8.9x105 and 7.4x105 spores ml-1 respectively. At the highest concentration of 108 spores ml-1, the Median LT50 values for B. bassiana, H. thompsonii, V. lecanii, C. oxysporum and M. anisopliae were 3.63, 3.64, 3.90, 5.24 and 5.54 days, respectively. The LT50 values were found to be inversely proportional to the spore concentrations. Among the five entomopathogenic fungi, V. lecanii, H. thompsonii and B. bassiana were found to be the promising virulent isolates. By testing their field efficacy, they can be used as potential biocontrol agent for the management of cowpea aphid.
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