Abstract
All five abscissants tested enhanced lemon fruit removal compared with unsprayed controls when the fruits were mechanically shaken off the trees one week after treatment. However, two abscissant combinations incorporating dikegulac-sodium or ethephon were no better than either compound used alone. Ethephon as Ethrel, which was the most effective of the compounds used, induced 88% removal of mature lemons with 43% true abscission and reduced the fruit detachment force from 8.9 to 6.8 kg cm-2. It also resulted in the lowest percentage of fruit removed with stems, 51% compared with 69% for untreated fruit.

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