The effects of different Neozygites fresenii release strategies were tested on cotton aphid populations in early and late season cotton in Fayetteville, Arkansas. Treatments consisted of 0, 5, 10, and 25 infected aphid cadavers per plant. A fifth treatment consisted of desiccated cotton leaves with infected aphid cadavers, collected during the middle of an epizootic in a commercial cotton field in 2003. In past trials, 25 cadavers were used to inoculate each cotton plant. The goal of our research is to determine the optimum number of cadavers to release on each plant to efficiently and economically initiate epizootics.