The study was carried out to reduce the losses due to the yield-fruit quality caused by the pre-harvest fruit drop problem of the ‘Golden Delicious’ variety. To increase the profitability of the producer in the orchards established with this variety, the effects of ReTain, a human and environmentally friendly commercial product that can be used in practical application, in different dosages on pre-harvest fruit drop, and fruit quality were examined. The study was conducted in the ‘Golden Delicious’ apple orchard grown in two different locations (Egirdir and Civril) between 2016 and 2017. ReTain’s dosages of 830 g/ha, 700 g/ha, 550 g/ha, 400 g/ha were applied to fruits and leaves 4 weeks before the estimated harvest. Water + Tween 20 (surfactant) were sprayed to control trees. In both locations, all ReTain applications had significantly reduced pre-harvest fruit drop. It also increased the fruit size and weight. As a result, considering both fruit loss and fruit quality; the most suitable practical application for the ‘Golden Delicious’ apple variety was determined to be ReTain 830 g/ha 4 weeks before the estimated harvest.

本研究旨在减少因“金冠”品种采前落果问题造成的产量-果实品质损失。为了提高使用该品种建立的果园的生产者的盈利能力，研究了 ReTain（一种可用于实际应用的人类和环境友好型商业产品）在不同剂量下对采前落果和果实品质的影响. 该研究于 2016 年至 2017 年间在两个不同地点（Egirdir 和 Civril）种植的“Golden Delicious”苹果园进行。ReTain 的剂量为 830 克/公顷、700 克/公顷、550 克/公顷、400 克/公顷，分别为在预计收获前 4 周施用于果实和叶子。喷洒水+吐温20（表面活性剂）以控制树木。在这两个地方，所有 ReTain 应用都显着减少了收获前的落果。它还增加了果实的大小和重量。因此，兼顾果实损失和果实品质；“金冠”苹果品种最适合的实际应用被确定为在预计收获前 4 周保留 830 克/公顷。