[Fungus, Metarrhizium anisopliae, as a possible regulator of the number of horseflies].

In water bodies of the flood-plains of the Ili and Turgen rivers (Alma-Ata district) there were found larvae of Tabanus autumnalis infected with the fungus Metarrhizium anisopliae. Experiments on the infection of T. autumnalis with this fungus yielded 100% mortality of larvae and adult insects. The possibility of creation of an artificial infection nidus under natural conditions was established.