Effect of application of naphthaleneacetic acid on berry thinning of Carignane grapes

Authors

  • A. Miele Department of Viticulture and Enology, University of California, Davis, U.S.A.
  • R. J. Weaver Department of Viticulture and Enology, University of California, Davis, U.S.A.
  • J. O. Johnson Department of Viticulture and Enology, University of California, Davis, U.S.A.

DOI:

https://doi.org/10.5073/vitis.1978.17.369-376

Abstract

Application of NAA on Carignane grapes at 70 % calyptra fall reduced berryset and weight per cluster. Crop yield per vine was decreased both by application of NAA at bloom at 10 and 25 ppm and at 2 weeks after bloom at 25 ppm. °Brix was usually increased by NAA applied at bloom or 2 weeks after bloom. However, total titratable acidity did not change as a result of NAA in any of the treatments. The looseness of clusters treated at the bloom stage tended to increase with higher levels of NAA. NAA has not been cleared for use on grapes as a thinning agent in the United States by the Environmental Protection Agency.

Einfluß der Naphthylessigsäure-Behandlung auf das Ausdünnen der Trauben bei der Rebsorte Carignane

Wurden die Infloreszenzen der Sorte Carignane mit NES behandelt, wenn 70 % der Calyptren abgefallen waren, so waren sowohl der Beerenansatz als auch das Gewicht je Traube herabgesetzt. Der Traubenertrag je Rebe war bei Anwendung von 10 und 25 ppm NES zur Blütezeit und ebenso bei Behandlung mit 25 ppm NES 2 Wochen nach der Blüte verringert. Die gesamte titrierbare Säure war jedoch bei keiner Variante verändert. Die durch NES-Anwendung in der Blühphase erzielte Lockerbeerigkeit der Trauben verstärkte sich durch höhere Konzentrationen.
Das Umweltschutzamt der USA hat über die Zulassung von NES als Ausdünnungsmittel noch nicht entschieden.

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Published

2016-06-22

Issue

Vol. 17 No. 4 (1978): Vitis

Section

Article

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