Ethephon as Harvest-aid for Muscadine Grapes1

in HortScience
Authors:
S. C. PhatakDepartment of Horticulture, Coastal Plain Experiment Station, University of Georgia, Tifton, GA 31794

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M. E. AustinDepartment of Horticulture, Coastal Plain Experiment Station, University of Georgia, Tifton, GA 31794

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J. S. MasonDepartment of Horticulture, Coastal Plain Experiment Station, University of Georgia, Tifton, GA 31794

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Abstract

(2-Chloroethyl)phosphonic acid (ethephon) was applied at 0, 570, 1000 and 2000 ppm to muscadine grapes (Vitis rotundifolia Mich. cv. Hunt), 1, 2, or 3 days before once-over harvest. All ethephon treatments increased berry abscission and reduced skin tear due to harvest when berries were harvested 2 days or 3 days after spraying. Delaying harvest to 3 days after treatment with 2000 ppm ethephon increased berry abscission to 46% and reduced skin tear to 9% in 1977. In 1978, 2000 ppm of ethephon increased berry abscission to 29% and reduced skin rupture to 29%. Taste panels could not detect flavor difference from the ethephon treatments.

Contributor Notes

Received for publication October 29, 1979. Supported by State, Hatch and IR-4 funds allocated to the Georgia Agricultural Experiment Stations.

The cost of publishing this paper was defrayed in part by the payment of page charges. Under postal regulations, this paper must therefore be hereby marked advertisement solely to indicate this fact.

Ethephon was provided by Amchem Products, Inc., Ambler, PA.

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