A systematic study was conducted to develop the cost effective entomopathogenic fungal biopesticide. The different grains like Sorghum, Ragi, Paddy and Rice were selected based on their local availability and their lower in cost. However the carbon and nitrogen requirement was met by adding 1 per cent yeast extract. Among all the treatments, the half crushed rice kernels used treatment showed their best by producing highest spore load of 2.15 spores g-1. This was followed by half crushed Sorghum and Maize. Rice kernels also retained the highest B:C ratio (7.91:1). All together it is concluded that Rice and Sorghum could be considered as the best source for mass production of entomopathogens.