Technical Abstract: The beneficial fungus Beauveria bassiana is pathogenic to various insect pest species. We are testing the potential of B. bassiana to control Curculio caryae, the pecan weevil. It is conceivable that fungicide sprays that are used to suppress fungal diseases of pecan or other crops could impair the effectiveness of the beneficial fungus. Comparison of seven B. bassiana strains indicated some are naturally far more resistant to fungicides than others. Artificial genetic selection resulted in enhanced fungicide resistance in a commercially available strain. Repeated fungicide exposure enhanced virulence to pecan weevil larvae in one strain of B. bassiana and did not affect virulence in another strain tested. We conclude that application of B. bassiana can be compatible with fungicide sprays because resistant strains of B. bassiana can be found either naturally or selected for.