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Am. J. Enol. Vitic. 45:2:150-154 (1994)
Copyright © 1994 by the American Society for Enology and Viticulture.
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Comparisons of Thompson Seedless Clones for Raisin Production

L. Peter Christensen 1 and Mary L. Bianchi 2

1 Department of Viticulture and Enology, University of California, Davis, and Kearney Agricultural Center, 9240 S. Riverbend Avenue, Parlier, CA 93648
2 University of California Cooperative Extension, 2156 Sierra Way, Suite C, San Luis Obispo, CA 93401.

A three-year study was conducted to compare three Thompson Seedless clones, 1A, Urla-HT, and Enns-HT. 1A is a University of California non-registered selection with mild grapevine leafroll; Urla-HT and Enns-HT are Turkish and California selections, respectively, heat-treated and registered virus-free. 1A and Urla-HT were compared with both cane- and long-spur pruning to determine if Urla-HT was more fruitful with spur pruning as reported. Enns-HT was compared under cane pruning only. Orthogonal comparisons of 1A vs. Urla-HT (all pruning treatments) and 1A vs. Enns-HT (cane pruning only) found 1A to produce higher raisin yields than Urla-HT or Enns-HT. This was attributed to the heavier berries and clusters of 1A. Additionally, 1A was more fruitful than Urla-HT, a contradiction to Urla's reported high fruitfulness characteristics. The larger vine size of Enns-HT confirmed field observations of vine growth but was accompanied by lower productivity as compared to 1A. The better performance of 1A, in spite of virus presence, suggests possible genetic differences in these clonal comparisons.

Key words: grapes, raisins, Thompson Seedless, clones

Submitted on April 15, 1992






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Copyright © 1994 by the American Society for Enology and Viticulture.