Cold Hardiness of Leaf and Stem Organs of Rhododendron Cultivars1
1981; American Society for Horticultural Science; Volume: 106; Issue: 5 Linguagem: Inglês
10.21273/jashs.106.5.608
ISSN2327-9788
AutoresMary A. Holt, Norman E. Pellett,
Tópico(s)Powdery Mildew Fungal Diseases
ResumoAbstract Leaves and stems from 7 field-grown cultivars of Rhododendron were frozen in laboratory tests from September to December or January for 2 successive winters to determine the temperature causing injury to selected organs. In all cultivars, the leaf midrib, petiole, and stem extraxylary (cambium, phloem, and cortex) organs were the least cold-hardy, while the stem xylem and leaf intervein were the most cold-hardy. Organs of ‘Lee’s Dark Purple’ and ‘Cataw-biense Boursalt’ rhododendrons were the most cold-hardy by December while ‘Caractacus’, ‘America’, and ‘Nova Zembla’ were the least cold-hardy. Field temperatures similar to those causing injury in the laboratory resulted in leaf and stem damage in early December.
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