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Spring frost damage has been a problem in pistachio producing areas. This experiment was conducted to evaluate the effect of ethephon application rate and date on bloom and maturity delay, fruit set, and yield of ‘Kalleh-guchi’ pistachio in Rafsanjan, Iran. Fourteen-year-old whole trees were sprayed with 0, 250, 500, and 750 mg·L−1 ethephon on February 10 or March 1 for single application and both...