A mathematical model relating environmental temperatures to rest completion of 2 peach cultivars has been developed. The model equates temperatures to effective chill-units, such that, one can predict when rest will or has been completed with a high degree of accuracy.

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A model has been developed that relates the stages of spring bud development of ‘Redhaven’ and ‘Elberta’ peaches (Primus persica (L.) Batsch) to an accumulation of growing degree hours following rest completion. The accumulation of growing degree hours is based on a lower limit of 4.5°C and an upper limit of 25°.

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Temperature treatments influenced inception, intensity and termination of rest in peach trees [Prunus persica (L.) Batsch]. A substance that affected the response was translocated within the trees. The time of leaf abscission in the fall was related to duration and intensity of rest in ‘Gleason Elberta’ peach leaf terminal buds. An August application of 100 ppm gibberellic acid (GA3) and warm field temperatures delayed defoliation and extended rest.