SADH, applied as postbloom sprays to 9 peach cultivars in a series of experiments from 1964 to 1969, accelerated maturation and reduced the number of pickings required for most cultivars. Although SADH did not affect the number of fruits per tree, yield, or fruit size, it advanced the maturity date of ‘Ranger’ as much as a week; that of ‘Blake’ 4 days. ‘Cardinal’, an early cultivar, was not noticeably affected by SADH applied at different stages of development. SADH caused fruit to abscise more readily from the stem and left less fruit remaining on the trees when harvested mechanically. SADH had no detrimental influence on ‘Redglobe’ peaches stored at 50°F for 3 weeks. These effects support the feasibility of using SADH as an aid in mechanically harvesting freestone peaches intended for fresh market.