Laboratory evaluations compared several types of soil amendments in their abilities to increase the persistence of Beauveria bassiana (Balsamo) Vuillemin in soils. Comparisons were based upon recovery of fungal propagules from amended soils treated with commercial preparations of B. bassiana. These comparisons coupled with data on the nutritional aspects of the amendments will be used to develop improved methods of applying B. bassiana to pecan orchard soils for sustainable management of the pecan weevil, Curculio caryae (Horn).