Ulmus 'Morton Red Tip'

Ulmus hybrid
Details
Hybrid parentage	Ulmus 'Morton' Accolade open pollination
Cultivar	'Morton Red Tip' = Danada Charm™
Origin	USA

The hybrid cultivar 'Morton Red Tip' (Danada Charm) is another Morton Arboretum selection, derived from an open pollination of the 'Morton' Accolade hybrid cultivar. The tree has occasionally been reported as a result of the hybridization of Accolade with the Siberian Elm Ulmus pumila,^[1] an error probably owing to the use of U. pumila as rootstock.

Description

The tree has a graceful, vase-shaped habit resembling the American Elm Ulmus americana with foliage tinged red on emergence.

Pests and diseases

Although highly resistant to Dutch elm disease, 'Morton Red Tip' (Danada Charm) is very susceptible to the elm leaf beetle Xanthogaleruca luteola ^[2][1], Japanese Beetle,^[3] and Gypsy moth; it is also moderately preferred by cankerworms.^[4][5]

Cultivation

'Red Tip' is very cold hardy; in artificial freezing tests at the arboretum ^[6] the LT50 (temp. at which 50% of tissues die) was found to be - 31 °C. However, the tree is notorious for its stem breakage owing to narrow crotch angles and included bark; in trials at the University of Minnesota it had the unhappy distinction of being the worst of 17 cultivars for breakage.^[7] The tree is currently being evaluated in the National Elm Trial coordinated by Colorado State University.

'Morton Red Tip' (Danada Charm) is being promoted by the Chicagoland Grows corporation, but is not widely available in the USA. It is not known (2008) to have been introduced to Europe or Australasia.

Etymology

Danada Charm is named for the Daniel F. & Ada L. Rice Foundation which helped sponsor the elm breeding programme at the Morton Arboretum.

Accessions

North America

• Brenton Arboretum, Dallas Center, Iowa. No details available.
• Chicago Botanic Garden, Glencoe, Illinois. 2 trees. No acc. details available.
• Dawes Arboretum [2], Newark, Ohio. 2 trees. No acc. details available.
• Morton Arboretum. Acc. no. 60-2003.
• University of Idaho Arboretum. Acc. no. 1998012

Nurseries

North America

• J. Frank Schmidt & Son Co. [3], Boring, Oregon
• Johnson's Nursery [4], Menomonee Falls, Wisconsin
• Sun Valley Garden Centre [5], Eden Prairie, Minnesota

References

1. ^ http://www.fs.fed.us/psw/programs/cufr/products/CUFR_780_Elm_trials_2009.pdf
2. ^ McPherson, G. et al. (2008). National elm trial: Initial report from Northern California. Western Arborist, Fall 2009, pp 32-36.
3. ^ Brady, C., Condra, J., & Potter, D. (2008) Resistance of Landscape-suitable Elm (Ulmus spp.) Cultivars to Japanese Beetle, Leaf Miners, and Gall Makers. 2008 Research Report, Nursery & Landscape Program, pp 15, 16. University of Kentucky.
4. ^ Guries, R. P. & Smalley, E. B., (1986), Proc. Third Nat. Urban Forestry Conf., pp 214–218, 1986, Orlando, Florida.
5. ^ Santamour, F. S., & Bentz, S. E. Updated checklist of elm (Ulmus) cultivars for use in North America. Journal of Arboriculture, 21(3): May, 1995.
6. ^ Shirazi, A. M. & Ware, G. H. (2004). Evaluation of New Elms from China for Cold Hardiness in Northern Latitudes. International Symposium on Asian Plant Diversity & Systematics 2004, Sakura, Japan.
7. ^ Giblin, C. P. & Gillman, J. H. (2006). Elms for the Twin Cities: A Guide for Selection and Maintenance. University of Minnesota.

External links

• 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.
• http://www.mortonarb.org/plantinfo/plantclinic/phc/New-Elms-For-The-Landscape.pdf. Miller, F. (2002). New elms for the landscape and urban forest.