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Resistance of house flies to chemical insecticides is increasing in the world, thus calling for sustainable control methods of flies. In this study, larvicidal and adulticidal activities of  Beauveria bassiana  strain DEBI 008 against the house fly were evaluated. Also, we examined the horizontal transmission of the  B. bassiana  between adult house flies of both sexes. Then, the susceptibility level of immature house flies to diflubenzuron was determined. In addition to synergistic effects, we investigated the combining low doses of  B. bassiana  and diflubenzuron on the house fly larvae. In the pathogenicity assay using direct application, the mean lethal concentration values (LC 50 ) were estimated for larvae (4.71×10 6 , conidia/ml) and adults (5.65×10 7 , conidia/ml) after 10 days. Based on mean lethal time (LT 50 ) of adult house flies, it was observed that LT 50  at the high concentration of 1 × 10 8  conidia was in the range of 4.89 days with 100% mortality; LT 50  at the lowest concentration of 10 5  conidia ranged from 10 to 15 days with 48% mortality. The results of  B. bassiana  in horizontal transmission assays on adults also showed that LT 50  for the females infected by horizontal transmission was 5.33 days with 100% mortality; meanwhile, for males horizontally infected with 100% mortality, this was 6.11 days. The susceptibility of the house fly population to diflubenzuron (LC 50 ) was 1.21 (mg/ kg), and high mortality was recorded at the highest concentration treated (6 mg/ kg) with 89.33% mortality. Synergistic interactions between  B. bassiana  and diflubenzuron were observed with the increased mortality rates of the combined treatment. The most significant synergy based on Finney’s method was the combination of LC 25  ( B. bassiana )+ LC 20  (diflubenzuron) ( χ2   = 60.75). Therefore, combined use in a synergistic manner could result in the enhanced biological control by accelerating the  B. bassiana  strain and diflubenzuron. The results of this study could be, therefore, helpful for integrated pest management to control the house fly.

biocontrol science and technology

Efficacy and horizontal transmission of  Beauveria bassiana  and its synergistic activity with diflubenzuron against the house fly,  Musca domestica  L.