Chemical regulation of cold hardiness is a fascinating objective for pomological research. In the past 5 years gibberellic acid (GA) and N-dimethylamino succinamic acid (Alar) have been reported to increase fruit bud hardiness of peaches (3, 4, 7). Trees treated with these two chemicals and 2-chloroethane phosphonic acid (Ethrel) were exposed to -11°F on December 30, 1968, permitting us to observe their effects on resistance of fruit buds to cold injury.
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Proebsting et al. (1969) studied this question.