Abstract

Abstract Fruit of apple (Malus domestica Borkh. cv. Golden Delicious) sprayed with triethanolamine salt of silvex [2-(2,4,5-trichlorophenoxy) propionic acid] (2,4,5-TP), a finely dispersed aluminum oxide (Sun Clear), and potassium salt of a fluorochemical carboxylic acid (L-4749) had better finish than controls. Fruit size and seed numbers were significantly reduced by higher rates of 2,4,5-TP. Sprays of a mixture of anion acrylic polymer binding agents (Acrylocoat), poly-l-p-methen-8-9 diyl (Vapor Guard), and a nonionic dimethyl polysiloxane (Dow Corning Silicone 24) increased russeting on ‘Golden Delicious’ apple fruit. Fruit enclosed in a paper bag 16 days after bloom gave a greater reduction in russet than any spray treatment.

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