Timing of high temperature influences chilling negation in dormant apple trees
1992
Young, E.
Budbreak and root and shoot extension growth of apple trees (Malus domestica Borkh. MM.111) were affected by exposure to 500 hours of higher temperatures (15, 20, or 30C) during the first, second, or third 500 hours of a 1500-hour, 5C chilling period. Exposure to 15C during the third 500 hours had a significant positive effect on budbreak, 20C at this time had no effect, and all other treatments had a negative effect on budbreak and new root and shoot growth.
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