Abstract
Abstract L-77, a nonionic organo-silicone block copolymer surfactant, significantly increased [14C]GA3 uptake and physiological effects of GA3 on ‘Marsh’ seedless grapefruit, as compared with the commonly used surfactant Triton B 1956. Effects on fruit strength at harvest were assessed by testing rheological parameters and evaluating peel color. Corroborating results also were obtained in field trials with ‘Minneola’ tangelo and ‘Clementine’ tangerine. Using L-77, even one single fall application of 1 ppm GA3 proved commercially effective.
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