The Effects of Gibberellic Acid on Flower Differentiation, Date of Bloom, and Flower Hardiness of Peach1

Abstract

Abstract Gibberellic acid (GA), when applied to peaches from early August to early September at 200 ppm, resulted in flower thinning, bloom delay, and increased hardiness near bloom. Early August treatments were more effective than earlier or later applications. A morphological study of buds after treatment indicated that GA: delayed flower initiation, delayed development after initiation, resulted in smaller buds, and delayed microsporogenesis.