High night temperatures during bloom affect fruit set in peach

Robert E. Rouse, Wayne B. Sherman


The development of low-chill peach [Prunus persica (L.) Batch] cultivars in the University of Florida breeding program has expanded peach production into subtropical climates of the world. Many of these areas have successful production, but others, including south Florida, experience lack of fruit set due to high night temperatures during bloom. We have observed variability in fruit set among low-chill peach cultivars (less than 250 chill units) when minimum night temperatures are above 56F during bloom. Based on data from the past three fruiting seasons, cultivars that tolerated high night temperatures were 'Flordaprince', 'TropicBeauty', 'Flordaglo', 'TropicSnow', some advance peach selections, and 'Sunbest' nectarine. Genotypes that did not set adequately were 'UFGold', 'UFO', and several advanced selections. New low-chill genotypes will be evaluated annually for ability to set fruit when high-night temperatures occur during bloom.


prunus persica; low-chill; subtropical climate

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Proc. Fla. State Hort. Soc.     ISSN 0886-7283