Abstract
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% H<sub>2</sub>CN<sub>2</sub>, 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.
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