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Development of Deep Supercooling in Acclimating Sweet Cherry and Peach Flower Buds


The development of deep supercooling in sweet cherry (Prunus avium L. ‘Bing’) and peach [Prunus persica (L.) Batsch ‘Redhaven’] flower buds during late summer and early autumn was measured by differential thermal analysis. The capacity to deep supercool developed under ambient conditions during September in both 1982 and 1983. It developed 1-2 weeks earlier in sweet cherry than in peach flower buds. Exposing a sweet cherry limb in situ to daily 15° day/5°C night temperatures beginning in early Aug. 1983 advanced the development of the flower buds’ capacity to deep supercool by 4 weeks. Sweet cherry flower buds whose capacity to deep supercool was advanced by exposure to these cool temperatures displayed a median low-temperature exotherm (LTE50) near - 20°. This demonstrated the potential capacity of sweet cherry flower buds to avoid injury during moderate freezes as early as mid-August.