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Objective: This study was carried out to determine determination of the relationships between population density of Cherry fruit fly, Rhagoletis cerasi L. (Diptera: Tephritidae) harmful on growning cherry and sour cherry in Erzincan province and plant phenology in 2016-2018.
Materials and Methods: The studies were carried out in randomly selected 10 orchards, including 5 orchards in Erzincan Central district and 5 orchards in Üzümlü district. The studies were carried out during the May-July, the traps were checked once a week, and the adult flies coming to the trap and plants phenologies were recorded.
Results: As a result of the study, it was determined that population density of the Cherry fruit fly in Erzincan Central district is higher than that of Üzümlü district; adult flies emerged in the nature end of the flowering period or before veraison period; depending on the phenology, adults were seen in cherry trees one or two weeks before than in sour cherry trees.
Conclusion: As a result of the study, it was determined that adult flies emerged in the nature end of the flowering period or before veraison period, their populations increase during the veraison period, and reach the highest population density before maturation or maturation period; depending on the phenology in the cherry orchards of Erzincan province established with the late cherry variety and pollinator varieties. Considering these outputs between the pest and host phenology, success against the pest can be achieved with a single pesticide application with a selective chemical in the management against the pest.