Pioneer (elm hybrid)

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Ulmus Pioneer
Hybrid parentage
U. glabra × U. minor
Cultivar
Pioneer
Origin
USA

The elm hybrid U. × hollandica Pioneer is an American development arising from the crossing of two European species, the Wych Elm U. glabra and the Smooth-leaved Elm U. minor subsp. minor. It is very fast growing and distinguished by a dense, globular crown casting a heavy shade. Its resistance to Dutch elm disease is somewhat less than other American hybrids, and it was omitted from the elm trials [1] in eastern Arizona conducted by the Northern Arizona University. Pioneer has had a very limited introduction to Europe, featuring in street tree trials in several Dutch cities in the late 1990s.

Contents 1 Arboreta etc. accessions 1.1 North America 1.2 Europe 2 Nurseries 2.1 North America 2.2 Europe 3 Synonymy 4 References 5 External links

[edit] Arboreta etc. accessions

[edit] North America

• Bartlett Tree Experts acc. nos. 85-0195, 85-0199
• Denver Botanic Gardens, no details available
• Holden Arboretum acc. no. 90-58
• New York Botanical Garden acc. no. 955/97
• Smith College acc. no. 5603

[edit] Europe

None known.

[edit] Nurseries

[edit] North America

• Bailey Nurseries [2], St. Paul, Minnesota
• ForestFarm [3], Williams, Oregon

• Pea Ridge Forest [4], Hermann, Missouri

[edit] Europe

None known.

[edit] Synonymy

None.

[edit] References

• Burdekin, D. A. & Rushforth, K. D. (Revised by Webber J. F. 1996). Elms resistant to Dutch elm disease. Arboricultural Research Note 2/96. Arboricultural Advisory and Information Service, Alice Holt, Farnham, UK.
• Santamour, J., Frank, S. & Bentz, S. (1995). Updated checklist of elm (Ulmus) cultivars for use in North America. Journal of Arboriculture, 21:3 (May 1995), 121-131. International Society of Arboriculture, Champaign, Illinois, USA.

[edit] External links

• http://www.extension.iastate.edu/Publications/SUL4.pdf Summary, inc. photographs, of elm cultivars resistant to Dutch elm disease available in the USA.
• http://fletcher.ces.state.nc.us/programs/nursery/metria/metria11/warren/elm.htm Warren, K., J. Frank Schmidt & Son Co. (2002). The Status of Elms in the Nursery Industry in 2000.