PT - JOURNAL ARTICLE AU - Kirpal Singh AU - Robert J. Weaver AU - Johnny O. Johnson TI - Effect of Applications of Gibberellic Acid on Berry Size, Shatter, and Texture of Thompson Seedless Grapes AID - 10.5344/ajev.1978.29.4.258 DP - 1978 Jan 01 TA - American Journal of Enology and Viticulture PG - 258--262 VI - 29 IP - 4 4099 - http://www.ajevonline.org/content/29/4/258.short 4100 - http://www.ajevonline.org/content/29/4/258.full SO - Am J Enol Vitic.1978 Jan 01; 29 AB - GA3 was sprayed on Thompson Seedless vines at five different stages of berry growth and development from bloom to véraison. All vines were girdled at fruit-set (FS). The application of GA3 [Bloom (B1) 15 ppm, FS 40 ppm] produced the smallest berries, and four sprays (B1 15 ppm, FS 40 ppm, two and four weeks after FS 40 ppm) resulted in the heaviest berries. GA3 at véraison had little or no effect on berry size.The ratio of length to width of berries was also increased by three and four sprays of GA3 with the ratio highest when four GA3 were used.The GA3 sprays after FS stage had no effect on the percentage shatter of berries, compared to controls. The °Brix was slightly less in the grapes which had received three or four repeat sprays of GA3. GA3 at véraison produced the hardest berries, as indicated by the force required for a probe to penetrate the flesh of these berries.