Laboratory bioassays to test the efficacy of unformulated and formulated Metarhizium anisopliae spores. The average percentage cumulative survival (±S.E.) of An. gambiae larvae (n = 3) exposed to (a) Unformulated Metarhizium anisopliae spores (control (C) and unformulated spores (Ma spores) (b) Pepper (control (P)) and Pepper formulated spores (Ma spores + P) (c) WaterSavr (control (WS)) and WaterSavr formulated spores (Ma spores + WS) (d) Ondina Oil (control (OO)) and Ondina oil formulated spores (Ma spores + OO) (e) ShellSol T (control (SS)) and ShellSol T formulated spores (Ma spores + SS) over 8 days post-treatment. Larvae that pupated are included as surviving.