Abstract
Abstract Eleven peach scion-rootstock combinations were evaluated for cold hardiness by controlled freezing after acclimation in controlled environments at temperatures of 20/14 or 10/4°C day/night and photoperiods of 9, 12 or 15 hours. Temperature and scion cultivar had much greater effects on cold hardiness of buds and bark than did photoperiod or rootstock. Trees held at 10/4° were more cold hardy than those held at 20/14°. ‘Siberian C’ scions were more cold hardy than ‘Harrow Blood’ or ‘Elberta’ scions. Short days increased cold acclimation of fruit buds at 20/14° but not at 10/4°. Rootstock influence on scion acclimation was small but some cultivar differences were apparent.
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