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- Author or Editor: John Fitzgerald x
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Grape clusters were subjected to one of two levels of leaf removal, one of two levels of preharvest ethephon spray, and either thinned to a basal cluster or left unthinned. Ethephon was applied at a concentration of 100 ppm two weeks after veraison. Affects on soluble solids content (SSC), titratable acidity (TA), pH, hue, chroma, and L, a, b values were not consistent. In 1989, light exposed clusters of thinned vines had significantly higher SSC. In 1990, when ethephon was applied to non-thinned vines, light-exposed clusters had higher SSC values than non-exposed clusters. Light, ethephon, or thinning in 1989 and light or ethephon in 1990 significantly increased TA. Ethephon in 1989 and light in 1990 significantly higher pH in 1989, and ethephon-treated clusters from thinned vines had significantly lower pH in 1990. Juice from light treatments in 1990 had significantly higher L, a, b, and chroma values. Ethephon significantly increased the “a” value of juice in 1989, and light significantly increased the “b” value. Hue was significantly different for light and ethephon treatments in 1989.