Abstract
Summary The sequence of freezing processes in fruit tree blossom and the possibilities of affecting them by application of growth regulators are discussed. Effects of exogenous growth regulators on frost damage to blossom are inconsistent. Their direct effects are negligible except when noxious. Their indirect effects depend on their reaction with endogenous growth regulators. In general, however, the growth stimulant gibberellic acid increased frost damage, while the retardants tended to reduce it when applied the previous year. Autumn sprays with B9 were the most effective of the treatments tested in increasing frost hardiness and frost avoidance on apple blossom, CCC was more effective on pears than on apples.
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