金冠苹果果锈这种病变可能是幼果发育初期赤霉素代谢发生了改变的结果。通过外用赤霉素可以减少果锈已为多个试验所证实。本试验目的在于探索防止果锈发生之最有效的赤霉素剂量,施用时期与次数,以及施用后对果形、种子数目所引起的副作用。赤霉素浓度分别为62.5、125、250毫克/升。按首次处理日期(14/4～12/5)、处理次数(3～8)、处理间隔时间(每周或间周处理)分为9种不同的处理方式,每种方式包含三种浓 Golden Delicious apple fruit rust this disease may be the early development of young fruit gibberellin metabolism has changed the result. Addition of gibberellins can reduce fruit rust has been confirmed by several experiments. The purpose of this experiment is to explore the most effective doses of gibberellic acid to prevent rust from occurring, the duration and frequency of application, and the side effects caused by the number of fruit and seeds after application. Gibberellin concentrations were 62.5,125,250 mg / liter. According to the first processing date (14/4 ~ 12/5), the number of processing (3-8), the processing interval (weekly or weekly processing) is divided into 9 different processing methods, each containing three kinds of concentrated