Experiments were performed to determine the effect of Accel and carbaryl on the fruit set, yield, quality, and leaf mineral composition of three apples cultivars: `Empire', `Jon-A-Red', and `Braeburn'. The treatments used were Accel at 25, 50, and 75 ppm; carbaryl at 0.05%, 0.1%, and 0.2%. There were significant increases in length: diameter ratio, weight of fruit per tree, pH, and percent red color. Mean fruit weight, percent N, K, and Mg as the rates of Accel and carbaryl increased. Sugar content in the fruit and the levels of P, Ca, Mn, Fe, Cu, and Zn in the leaves were not affected. We conclude that the increased fruit weights were due to increased cell numbers and the few fruit that remained after thinning, thereby leading to increased amounts of assimilates directed to the developing fruit. The increase in percent red color is indicative of the effect of the treatments on the degree of ripening.
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