Spore production and growth of Paecilomyces vairioti was observed on 5 different types of substrate through solid state fermentation technology viz . maize, bajra, rice, wheat bran and mixture of wheat bran with fine rice granules in their whole form as well as in their crushed form. Crushed rice was found to be a better substrate for maxi- mum spore production. Similarly two moistening agent were used of which the basal salt solution with yeast extract was found most suitable for the growth of P. vairoti.