RT Journal Article
SR Electronic
T1 Effect of Ethephon and Gibberellin on Maturation of Ungirdled Thompson Seedless Grapes
JF American Journal of Enology and Viticulture
JO Am J Enol Vitic.
FD American Society for Enology and Viticulture
SP 11
OP 13
DO 10.5344/ajev.1979.30.1.11
VO 30
IS 1
A1 Ghazi I. El-Banna
A1 Robert J. Weaver
YR 1979
UL http://www.ajevonline.org/content/30/1/11.abstract
AB Thompson Seedless grapevines were sprayed with either ethephon at 100, 250, and 500 ppm at véraison or with KGA3 at 5, 25, and 50 ppm one week after fruit-set. All fruits were harvested at about 19°Brix. Ethephon-treated grapes matured 16 days earlier than did the controls, and KGA3 retarded maturation 32 days beyond that of the non-treated vines. Thus the harvesting period for this cultivar was extended by about 48 days.Ethephon application had no effect on yield, cluster weight, berry weight, or size. However, KGA3 produced increases in the above-mentioned parameters. A high juice percent resulted from the application of these compounds, but ethephon treatments gave the higher values. Moreover, higher values in the °Brix/ acid ratio, and lower ones in acidity, were caused by ethephon. GA3 increased acidity, but decreased the °Brix/acid ratio.