Knowledge of flower phenology and reproductive activities is of significant importance, particularly in sweet and sour cherries which show different degrees of incompatibility. The main objective of this research is to understand the flower microphenology (Anther dehiscence and stigma viability) of Hungarian sour cherry cultivars (Botermo, Erdijubileum and Sigany) under Mashhad climatically conditions. For this purpose an experiment was conducted in 2005 and 2006 using a completely randomized design with 3 replication in 2005 and 5 replication in 2006. In order to check the phonological stages, flowers were taken in to consideration from before opening up to the browning phase of stigma. The duration of pollen shedding, stigma receptivity and climatic factors were measured. The relative time of flowering between cultivars varied from year to year. Data indicates that thermal variations strongly contribute to significant differences in the duration of stigma viability, although there were not significant differences between cultivars in anther dehiscence period.

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