The direct and indirect effect of a commercial formulation of Beauveria bassiana strain JW-1 was evaluated against five biological control agents. Orius insidiosus (Say), Phytoseiulus persimilis Athias-Henriot, Encarsia formosa Gahan, and Aphidius colemani Viereck were evaluated under greenhouse cage and laboratory conditions, and Ipheseius [Iphiseius] degenerans (Berlese) was evaluated under greenhouse conditions. The natural enemies were highly susceptible to infection under laboratory conditions, and lower infection rates were observed in the greenhouse trials. Aphidius colemani was the most susceptible and O. insidiosus was the least susceptible of the five natural enemies evaluated. Ipheseius degenerans was evaluated against the insect pathogens Beauveria bassiana strain GHA, Verticillium lecanii, and Metarhizium anisopliae to determine direct and indirect infectivity under laboratory conditions. Ipheseius degenerans was least susceptible to M. anisopliae followed by V. lecanii and B. bassiana. Applications of soap, neem oil, azadirachtin, or water against Ipheseius degenerans were evaluated under laboratory conditions. Water and soap resulted in significantly lower mortalities than neem oil and azadirachtin. Results indicate that with proper timing, mycoinsecticides, azadirachtin, neem oil, and soap can be used in combination with the natural enemies evaluated. none