Abstract
Abstract Six consecutive, single, annual applications of succinic acid–2,2-dimethylhydrazide (SADH) were applied, commencing with 2-year-old trees, in mid-July (51-67 days after full bloom) or mid-August at rates of 1000, 2000 or 4000 ppm. Other trees in the same block received 3 consecutive annual applications of 500 or 1000 ppm SADH in mid-June (31-40 days after full bloom) or mid-July. All SADH treatments delayed fruit flesh softening and reduced the severity of watercore and pre-harvest drop, but had no effect on trunk circumference increase, amount of bloom and fruit set. There was no terminal growth suppression of practical significance. With the exception of 500 ppm in mid-June or mid-July, all SADH treatments depressed fruit size. SADH suppressed rate of fruit growth and induced the formation of flatter fruits with shortened, thickened stems.
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