Abstract
Abstract Combination sprays of the growth regulators succinic acid-2-2-dimethylhydrazide (SADH), (2-chloroethyl)phosphonic acid (ethephon), and 2-(2,4,5-trichlorophenoxy)propionic acid (fenoprop) or naphthaleneacetic acid (NAA), applied on ‘Tydeman's Red’ apple trees 4 weeks before the estimated normal harvest date, advanced red coloration and maturity of the fruit sufficiently to permit harvest of approx ¾ of the fruit 2 weeks ahead of the normal harvest date. Of die materials tested the combination of SADH (2,000 ppm), ethephon (500 ppm) and fenoprop (20 ppm) produced the most pronounced effects.
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