AbstractThe production and biological activity of selected toxic metabolites of fungal biological control agents are reviewed. These metabolites include destruxins, oxalic salts, trichothecenes, zearalenone, fumonisins, fusaric acid and aflatoxin isolated from Metarhizium anisopliae, Beauveria bassiana, Trichoderma spp., Fusarium spp., Alternaria alternata, F. oxysporum and Aspergillus spp., respectively.