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Autumn hormone spray delays cherry bloom, cutting frost risk

PubMed · 2026-07-09

Spraying cherry and apple trees with ethephon in autumn can delay flowering by up to two weeks, potentially protecting blossoms from late spring frosts made more common by climate change. The effect was strongest in one cherry variety and minimal in apples, suggesting growers need cultivar-specific strategies.

1

Ethephon delayed flowering in cherry cultivar Kordia: only 56-63% of buds were in bloom on April 9 vs. 88% in controls.

2

Apple cultivars Elstar and Kanzi showed no significant flowering delay at either ethephon concentration or timing.

3

Final fruit set in Kordia dropped from 16% to 6% in the late-high treatment, but other treatments caused no significant yield loss.

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