| Summary: | This article considers the natural regulators of blood-sucking Simuliidae subzone of mixed forests on the territory of Belarus and Ukraine. In the mixed forests, the major regulators of preimaginal phases of bloodsucking blackflies are microsporidia (Polidyspirenia simulii,Polidyspirenia sp., Thelohania fibrata, Amblyospora bracteata, A. varians), fungi and mermithides (Gastromermis boophthorae). Caddisfly larvae (Hydropsyche angustipennis, Neureclipsis bimaculata, Polycentropus flavomaculatus,Cyrnus flavidus, Oligostomis reticulata, Brachycentrus subnubilus and Rhyacophila nubila) and fishes (Scardinius erythrophthalmus, Rutilus rutilus, Carassius carassius, Gobio gobio) significantly reduce the number of blackflies larvae and pupae. Adult blackflies are eaten by spiders (Araneus diadematus) dragonflies, robberflies, wasps,frogs (Rana temporaria and Rana terrestris), and insectivorous birds (Delichon urbicum, Hirundo rustica, Apus apus). Bactolarvicid and BLP-2477 are among the most effective biological products.
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