Experiments on thinning grapes with alpha-naphthaleneacetic acid and dinitro-sec-butylphenol

Authors

  • R. J. Weaver Department of Viticulture and Enology, University of California, Davis, California

DOI:

https://doi.org/10.5073/vitis.1963.4.1-10

Abstract

  1. Zinfandel vines at various stages of flower and fruit dev,elopment were sprayed in the years 1954, 1955, and 1956 with NAA in the range from 0 to 500 ppm. NAA at 5 to 10 ppm applied at bloom stage or 10 ppm NAA applied at fruit-set stage resulted in suitable loosening of clusters.
  2. In order to destroy the second-crop clusters, Zinfandel and Muscat of Alexandria vines were sprayed with NAA in a range from 0 to 300 ppm. Spraying was done when the second crop was in full-bloom or fruit-set stage, and the berries on primary clusters were larger and less susceptible to injury. NAA at 25 to 50 ppm sharply reduced the secondary crop without injury to the primary crop.
  3. DN-289 (dinitro-sec-butylphenol) in a range from 0.001 % to 0.3% was applied to Muscat of Alexandria vines at bloom and Zinfandel vines at fruit-set stage to determine its value in flower cluster and cluster thinning. DN-289 at 0.05% killed 95% of the clusters in both varieties; in Muscat only 3 to 5% of the leaves showed injury.

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Published

2017-02-22

Issue

Vol. 4 No. 1 (1963): Vitis

Section

Article

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