What does the published scientific research say about Isaria fumosorosea?

Isaria fumosorosea (syn. Paecilomyces fumosoroseus) is an entomopathogenic fungus covered by 8 PubMed-indexed studies in plant-input contexts. Peer-reviewed research spans target pests including Bemisia tabaci whitefly, Colorado potato beetle (Leptinotarsa decemlineata), rugose spiraling whitefly on oil palm, and European grapevine moth larvae — making it one of the more studied mycopesticide candidates in integrated pest management and biological control programs.

Reported efficacy varies by strain and host. Laboratory research cites 92.6% larval mortality against L. decemlineata with strain CCM 8367, rising to 98% when combined with the nematode Steinernema feltiae. Against Bemisia tabaci, blastospores are reported to kill nymphs faster and at lower concentrations than aerial conidia. Ancora® (strain PFR97) is among the commercial products evaluated in the literature. The same body of research records low susceptibility of box tree moth larvae (maximum ~60% mortality with strain CCM 8367), illustrating host-specific limits that researchers link to plant phytochemicals inhibiting spore germination.