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Accumulation of chilling hours (CH), chilling portions (CP), and growing degree hours (GDH) in the ‘Redhaven’ orchard. Major events are indicated with arrows. CH accumulation began on 7 October 2019, ethephon was applied on 24 October 2019, endodormancy of the control ended on 22 January 2020, GDH accumulation began on 23 January 2020, flowering of the control began on 18 March.
