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Am. J. Enol. Vitic. 59:1:83-87 (2008)
Copyright © 2008 by the American Society for Enology and Viticulture.
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Research Note

Effect of Gibberellic Acid and Paclobutrazol on the Incidence of Primary Bud Necrosis in cv. Shiraz (Vitis vinifera L.)

Cassandra Collins1,* and Belinda Rawnsley2

1 School of Agriculture and Wine, Waite Research Precinct, University of Adelaide, PMB 1, Glen Osmond, SA 5064, Australia; 2 South Australian Research and Development Institute, GPO Box 397, Adelaide, SA 5001, Australia.

* Corresponding author (email cassandra.collins{at}adelaide.edu.au)

Experiments were conducted on cv. Shiraz vines (Vitis vinifera L.) to evaluate the effect of gibberellic acid and paclobutrazol on the incidence of primary bud necrosis (PBN). An application of gibberellic acid (100 mg/L–1) one week before flowering, at flowering, and one week after flowering increased the incidence of PBN. The growth retardant paclobutrazol (100 mg/L–1) decreased the incidence of PBN when applied one week before and after flowering. Shoot length and cane diameter were significantly greater than controls following application of gibberellic acid. These results suggested a strong relationship among shoot vigor, gibberellins, and PBN.

Key words: gibberellic acid (GA3), paclobutrazol, primary bud necrosis, grapevines




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M. C. Vasconcelos, M. Greven, C. S. Winefield, M. C.T. Trought, and V. Raw
The Flowering Process of Vitis vinifera: A Review
Am. J. Enol. Vitic., December 1, 2009; 60(4): 411 - 434.
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Copyright © 2008 by the American Society for Enology and Viticulture.