PT - JOURNAL ARTICLE AU - Bruno Marangoni AU - Kay Ryugo AU - H. P. Olmo TI - Effect of Defoliation on Carbohydrate Metabolism in Thompson Seedless and Perlette Grapevines AID - 10.5344/ajev.1980.31.4.347 DP - 1980 Jan 01 TA - American Journal of Enology and Viticulture PG - 347--349 VI - 31 IP - 4 4099 - http://www.ajevonline.org/content/31/4/347.short 4100 - http://www.ajevonline.org/content/31/4/347.full SO - Am J Enol Vitic.1980 Jan 01; 31 AB - Perlette and Thompson Seedless vines were hand defoliated on August 1, just prior to harvest of the Perlette crop. Two other sets of Thompson Seedless vines were defoliated by hand and a chemical defoliant, Endothall, on September 13, four days prior to harvest. The total carbohydrate content on shoots of Thompson Seedless defoliated early was temporarily depleted. The depletion is attributed to the drain caused by the maturing crop. The reserves were partially replenished by the new leaves which emerged. Late defoliation had little influence on the carbohydrate reserves and did not induce new shoot growth.