Abstract
1. Foliage spray applications of maleic hydrazide were made to olive trees (Olea europaea L.) in California during the winter months under conditions of high humidity. They caused fruit abscission to occur, probably through a lowering of the natural auxin level in the fruit, with the consequent development of an abscission layer at the junction of the fruit and pedicel. A concentration of 1.0% maleic hydrazide with 0.1% Vatsol O.T. as a wetting agent caused about 95% of the fruit to drop when the branches were lightly shaken. 2. Some leaf abscission also resulted but was confined to the older leaves on shoots. Although growth was retarded following applications of maleic hydrazide, no visible injury to leaves or stems was noted. 3. A relatively small amount of maleic hydrazide, 0.15 p.p.m., was found in the oil extracted from fruits taken from trees sprayed with 1.0% MH-30.
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