Antitranspirant Effects on Fruit Growth of ‘Manzanillo’ Olive1

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Abstract
An antitranspirant (AT) applied 2 3 weeks before harvest accelerated olive (Olea europaea L., cv. Manzanillo) fruit growth and led to larger fruit at harvest. The fruit-enlarging effect was detected within 1 day of application. A simulated rain also increased fruit size, but much of the gain in size was lost as soon as the “rain” was terminated. Daytime fruit shrinkage was reduced significantly with the AT. At harvest, fruit moisture was higher in AT-treated fruits, and after harvest the water lost from fruits was lower. When AT was substituted for the last pre-harvest irrigation, fruit size was increased.

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