Submitted to: Eucarpia Fruit Breeding Symposium
Publication Type: Proceedings
Publication Acceptance Date: 12/1/2003
Publication Date: 1/1/2005
Citation: Luby, J.J., Bedford, D.S., Forsline, P.L. Winter Hardiness in the U.S. Department of Agriculture Malus Core Collection.. Eucarpia Fruit Breeding Symposium. 2005. ACTA Horticulture. 663: 605-608.
Interpretive Summary: Symposium paper does not require an interpretive summary.
Technical Abstract: A group of 200 Malus accessions have been designated as a 'core' of the complete collection held by the Plant Genetic Resources Unit (PGRU) of the U.S. Department of Agriculture (USDA) at Geneva, New York. A replicated planting of this core collection was established at Excelsior, Minnesota, USA in 1994. In 2002, the planting was evaluated for winter injury (WI) accumulated over 8 winters. The minimum temperatures during this period were lower than -26°C on several occasions with the lowest temperature of -38°C occurring in February 1996. Among the hardiest entries were accessions M. asiatica, M. baccata, M. brevipes, M. floribunda, M. ioensis, M. orientalis, and M. sieversii. Among the hardiest M. ×domestica entries were cultivars from Canada, Russia and the northern US including the cultivars Antonovka Kamenichka, Cortland, Haralson, Keepsake, McIntosh, Novole, Petrel, Viking, Yellow Transparent.