Integrating Predatory Mites and Pupal Parasitoids for Biological Control of the House Fly (Musca domestica)

Resistance of house flies to insecticides highlights the need for sustainable alternatives. We evaluated a biological control method combining parasitoid wasps and predatory mites under controlled laboratory conditions. The predatory mite Macrocheles muscaedomesticae and the parasitoids Spalangia cameroni and Muscidifurax raptorellus were tested in boxes containing 600 g of larval diet and 1,000 house fly eggs. Four treatments with 35 replicates each were compared. In the control, an average of 720 adult flies emerged. With parasitoids alone, 516 adults emerged; with predatory mites alone, 380 emerged; and with the combined treatment, only 277 adults emerged. All treatments differed significantly (p < 0.001). These results confirm that combining predatory mites and parasitoid wasps provides stronger suppression of house flies than either natural enemy alone. Such combinations represent a promising component of integrated pest management programs for house flies and may also be extended to other filth fly species such as the stable fly.