Abstract
Abstract Application of 2-chloroethylphosphonic acid (ethephon) to ‘McIntosh apples’ in late August significantly increased development of anthocyanins in fruit peel, shortening the time to harvest by approximately 2 weeks. At higher rates of ethephon, treatment with succinic acid 2,2-dimethyl hydrazide (SADH) prior to ethephon applications was necessary to maintain fruit firmness. 2,4,5-trichlorophenoxyacetic acid (2,4,5-T) contributed to excessive fruit cracking on the tree and in storage. SADH treatments were more effective than 2,4,5-T treatments in reducing accumulation of ethylene in stored fruit. Ethephon 50 ppm with SADH was more effective in producing desired fruit color, quality, and abscission characteristics than was the higher concentration of ethephon with SADH and 2,4,5-T.
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