PT  - JOURNAL ARTICLE
AU  - Ghazi I. El-Banna
AU  - Robert J. Weaver
TI  - Effect of Ethephon and Gibberellin on Maturation of Ungirdled Thompson Seedless Grapes
AID  - 10.5344/ajev.1979.30.1.11
DP  - 1979 Jan 01
TA  - American Journal of Enology and Viticulture
PG  - 11--13
VI  - 30
IP  - 1
4099  - http://www.ajevonline.org/content/30/1/11.short
4100  - http://www.ajevonline.org/content/30/1/11.full
SO  - Am J Enol Vitic.1979 Jan 01; 30
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.