Abstract
`Tifblue' Blueberries (Vaccinium ashei) have poor or delayed budbreak in warm growing regions due to a lack of chilling temperatures. Hydrogen cyanamide(H2CN2) is known to break dormancy in buds. We tested the response of `Tifblue' blueberry buds to concentrations of hydrogen cyanamide at different dormancy stages with respect to budbreak and phytotoxicity. Blueberry bud sticks were harvested during the growth season at three week intervals. H2CN2 (0.05, 0.125, 0.25, 0.5 M), hot water (47C) and a control (distilled water at 0C) were used. Treated bud sticks were forced to break under light at 18-26C. Flower and leaf buds broke after 10-14 days. H2CN2 above 0.25 M was highly phytotoxic to flower buds, but not leaf buds. H2CN2 at 0.125 M was most effective in breaking flower and leaf buds at all dormancy stages. ABA and polyamine levels in buds shall be analyzed.
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