HORMONE FRUIT SETTING OF THE SWEET CHERRY
High volume sprays of GA3 plus an auxin applied post-blossoming increased yields of several sweet cherry cultivars. Sprays of GA3 plus the auxin 2,4,5-TP (10 ppm) induced larger yield increases than similar sprays containing 2,4,5-T, NAA or NOXA. Yields were regularly increased on the cultivars Van and Merton Glory with only 50 ppm GA3 in the mixture; on other cultivars, such as Early Rivers, yields were consistently increased only when ≥200 ppm GA3 was included. Multiple sprays, each containing low concentrations of GA3 (≤50 ppm), have induced similar yield increases but less deleterious effects on floral bud numbers than single sprays containing 200 ppm GA3. Effects on fruit size and quality were acceptable.
Webster, A.D., Modlibowska, I. and Wickenden, M.F. (1983). HORMONE FRUIT SETTING OF THE SWEET CHERRY. Acta Hortic. 137, 285-292