Abstract
Abstract Sprays of 3-[2-(3,5-dimethyl-2-oxocyclohexyl)-2hydroxyethyl]-glutarimide (cycloheximide) for abscission of early and midseason oranges loosen fruit, but utilizing this response with a shaker + pickup machine harvest system generally show economic gain only on very large trees. Abscission chemicals (abscisors) lend to overloosen the oranges that are easiest to remove, yet fail to loosen adequately those that are normally most difficult to remove. In Florida, current economic conditions do not justify fruit removal much less than 100%. Fruit drops of up to 80% will probably result if abscisors are used to reduce pull forces of nearly all fruits on a given tree to 2.2 kg, the theoretical level desired for mechanical harvesting.
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