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Am. J. Enol. Vitic. 58:3:402-404 (2007)
Copyright © 2007 by the American Society for Enology and Viticulture.
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Research Note

Effects of Chilling and Garlic Extract on Bud Dormancy Release in Cabernet Sauvignon Grapevine Cuttings

Renato Vasconcelos Botelho1,*, Alexandre Pozzobom Pavanello2, Erasmo José Paioli Pires3, Maurilo Monteiro Terra3 and Marcelo Marques Lopes Müller1

1 Professor, 2 Academic, Departamento de Agronomia, Universidade Estadual do Centro-Oeste, R. Simeão Varella de Sá 03, 85040-080, Guarapuava-PR, Brazil; and 3 Researcher, Instituto Agronômico de Campinas, Caixa Postal 28, 13001-970, Campinas-SP, Brazil.

* Corresponding author (email: rbotelho{at}unicentro.br; tel/fax: 55 423621 1000) Manuscript submitted October 2006; revised January, March 2007. Publication costs of this article defrayed in part by page fees.

Chemical treatments to break bud dormancy are necessary in vineyards that experience mild winters. Cuttings with a single bud were sprayed with 1.5 or 3.0% garlic extract or 1.5% hydrogen cyanamide. The controls were treated with distilled water. Three lots of canes were submitted to 0, 168, 336, or 508 chilling hr (≤6.0°C), respectively, before spraying. All treatments improved and advanced bud sprouting over the control. The most effective treatment for bud dormancy release was 1.5% H2CN2, with up to 80% bud sprouting after 35 days, even for unchilled cuttings. Garlic extract also promoted bud sprouting, attaining greater than 70% budbreak after 35 days for cuttings chilled for 168, 336, and 504 hr. The chilling requirement for Cabernet Sauvignon appears to be close to 336 hr.

Key words: Vitis vinifera, budbreak, chilling requirements, hydrogen cyanamide






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Copyright © 2007 by the American Society for Enology and Viticulture.