Abstract
Abstract Various coating treatments werre applied to ‘Johnson Elberta’ peach [Prunus persica (L.) Batsch.] trees before budbreak to delay bloom and slow deacclimation. Phenological development was monitored by comparisons with a bud stage chart and hardiness was tested using a programmable freezing chamber. Applications of dormant oil at 2%, 5%, 10%, or 20% were equally effective. In 1984 and 1985, bloom was delayed 2.0 and 1.3 bud stages (5 days) and flower bud hardiness was increased 4.2 and 1.6C, respectively, when compared to the control. Oils applied at 20% concentration were phytotoxic to flower buds. Adding daminozide to various oil treatments produced no additional effect. Chemical name used: succinic acid-2,2-dimethyIhydrazide (daminozide).
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