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KMID : 0903619860270020157
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Journal of the Korean Society for Horticultural Science
1986 Volume.27 No. 2 p.157 ~ p.166
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Studies on the Occurrence of Cold Injury in Several Fruit Trees and Factors Affecting Cold Hardiness
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Abstract
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Factors affecting cold injury of apple trees, to provide some guidelines for minimizing cold injury, were investigated. Summarized results are as follows.
1. The percentage of cold injury, in the leaf-bud and xylem parenchyma of Mutsu cultivar was higher than those of Fuji and Spur EarliBlaze cultivars.
2. There was no relationship between cold hardiness and leaf fall date in the apple trees observed. Cold injury of the secondary branches was severer than that of the primary branches.
3. Flower buds were injured severely after 1 hour at continuous -40℃ and leaf-buds after 24 hours.
4. The younger sprouts (newly growing shoots) were more susceptible to cold injury, application of SADH improved cold hardiness, and water spray reduced the percentage of cold injury.
5. Required period for bud break of the cuttings in water was shortened with the cutting date passing from January to March; Mutsu cultivar was shorter than the other cultivars.
6. Girdling was the most effective treatment for the improvement of cold hardiness, but cold injury was increased with the increase of the amount of defoliation after girdling.
7. Cold hardiness was best in February and weakest in October.
8. Cold resistance of `Mutsu´ was weaker than that of `Spur EarliBlaze´.
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