What benefits of Willaertia magna have been cited in the scientific literature?

Peer-reviewed research on Willaertia magna identifies two distinct mechanisms relevant to potential label claims: direct antifungal activity against oomycete pathogens and systemic induction of plant host defenses. The literature reports fungicidal effects specifically against Phytophthora infestans and Plasmopara viticola — the organisms responsible for potato late blight, tomato late blight, and grapevine downy mildew.

For growers researching whether Willaertia magna controls late blight or downy mildew, the published trial data is specific. Greenhouse studies report up to 80% disease reduction; field trials report up to 77% protection against these targets. Suppression of tomato powdery mildew, caused by both Oidium neolycopersici and Leveillula taurica, is also cited in peer-reviewed research across these same crop systems.

The literature further reports that Willaertia magna elicits defense-related gene expression and signaling pathways in potato, tomato, and grapevine — a biostimulant-type mechanism distinct from direct pathogen kill. Field trial data also associates Willaertia magna applications with potato yield increases of up to 30%. These are findings cited in research publications, not approved label claims or regulatory endorsements.