Abstract
A thinning-timing study of apple, (Malus domestica Borkh. cv. `Royal Gala'), grown on M7a rootstock, was initiated during the Spring of 1992 to determine the optimum and last effective thinning date to affect `Royal Gala' apple size. Trees planted in 1987 in sandy-loam soil and trained on a three tier Ebro trellis system were used in this study. Thinning-timing treatments were begun at full bloom and continued weekly for four weeks making a total of five thinning dates and an non-thinned control. Each treatment's flowers and/or fruits were hand thinned to 15 - 20 centimeters between fruit on tree limbs. Measurements of the diameter of marked apples from each treatment were made weekly during the growing season to plot growth curves. Results show a significant difference of larger fruit size and weight of second and third thinning treatment dates as compared to the other treatment dates and the control.
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