Abstract. Brown mite (Bryobia rubrioculusScheuten) is widely spread around the world. Thismite is existed on someorchards in different areas of Iran especially in Hamedan province. In recent years, the mite has become economically important thus; this study was conducted under the lab conditions at 9 constant temperatures (15, 17.5, 20, 22.5, 25, 27.5, 30 and 32.5 35ºC), (±0.5); Rh % (60±5) and L: D 16:8, on sweet-cherry leaf discs. Our findings showed that the lowest mortality of pre-imaginal developmental time was at 15 ºC (52%) and highest at 32.5 ºC (85%). Moreover, it demonstrated that at 35 ºC no eggs hatched therefore, this temperature must have been considered as the lethal temperature for the growth mite and so, mortality depends on some environmental factors, particularlytemperature effects. Therefore, the results may be used to some aspect of integrated pest management of brown mitein sweet-cherry orchards.
