Response of Thompson Seedless grapes to prebloom thinning

Authors

  • A. Christodoulou Department of Viticulture and Enology, University of California, Davis
  • R. J. Weaver Department of Viticulture and Enology, University of California, Davis
  • R. M. Pool Department of Viticulture and Enology, University of California, Davis

DOI:

https://doi.org/10.5073/vitis.1967.6.303-308

Abstract

  1. Paired treatments with and without application of GA at bloom were applied to Thompson Seedless vines that were
    • cluster-thinned at prebloom, and berrythinned at shatter,
    • cluster-thinned and berry-thinned at prebloom, or
    • cluster-thinned and berry-thinned at shatter stage following bloom.
    Unsprayed clusters from vines that were cluster-thinned at prebloom or cluster- and berrythinned at prebloom stage were very compact. All combinations of thinning that included applications of GA at bloom produced clusters that were looser than the corresponding unsprayed clusters. GA increased berry size, and clusters that received GA usually had fewer shot berries than did corresponding unsprayed clusters.
  2. Prebloom thinning increased the number of berries per cm. of lateral, but applications of GA at bloom greatly decreased the amount of set.
  3. A reduction of flower shatter occurred as a results of prebloom thinning.

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Published

2017-02-22

Issue

Vol. 6 No. 3 (1967): Vitis

Section

Article

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