Entomopathogenic fungi are important as natural control agents of many insects, including several pests (Carruthers & Hural, 1990). In Integrated Pest Management (IPM), biological control with entomopathogens should be considered as an important reduction factor in pest population density. So, the conservation of entomopathogens is needed if they occur naturally, are applied or introduced with the objective of controling pests. However, the use of incompatible pesticides may inhibit the development and reproduction of these pathogens, affecting IPM (Malo 1993, Duarte et al. 1992, Anderson & Roberts 1983).