Brown mite, Bryobia rubrioculus, is a species found on aerial position on deciduous and coniferous trees. B. rubrioculus attacks a number of fruit trees in the west of Iran and the highest population of the brown mite was observed on the sweet-cherry as a predominant mite (Khanjani & Haddad Irani-Nejad, 2006; Honarparvar et al., 2013). In late June 2014, the brown mite was collected from sweet cherry orchards in Hamedan provinces. Immature stages (larvae, protonymph and deutonymph) and females of B. rubrioculusScheuten, reared on sweet cherry for 2 generations in germinator under constant condition: (25 ± 0.5) °C, (L: D) (16:8), and (60 ± 5) RH, in the lab of Bu Ali-Sina university, Hamedan, Iran, are re-described and illustrated in the current work. Furthermore, a key to Iranian species of the genus Bryobia is presented.
