Abstract
Two strains of the entomopathogenic fungus Entomophthora virulenta have been examined for their pathogenicity to adult blowflies Calliphora erythrocephala, for their ability to grow on defined media and for the production of biologically active secondary metabolites. It was found that the fungus could produce a 100% mortality in the blowflies without extensive colonisation of the host and when grown on a glucose asparagine medium produced a mixture of: azoxybenzene-4,-4′-dicarboxylic acid, 4′-hydroxymethylazoxybenzene-4-carboxylic acid and p-amino benzoic acid. The hydroxy acid proved toxic by intrahaemocoelic injection of the adult blowflies and accounted for all of the extractable insecticidal activity.
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