Early-season epizootics of the aphid pathogenic fungus, Neozygites fresenii, were identified in Concordia Parish, Louisiana. Aphid/fungus-infested plants from a commercial cotton field were collected and transported to commercial cotton fields in Mississippi Co., Arkansas in order to inoculate the fields with fungus. Significantly more aphids were infected near release sites than 60 meters distant at both 1 and 2 weeks after the releases were made. The results support the idea that fungus can be introduced to a field and spread in the aphid population.