Ulmus americana 'Ascendens'

Ulmus americana
Cultivar	'Ascendens'
Origin	Seneca Park, Rochester, New York

The American Elm cultivar Ulmus americana 'Ascendens' is a relatively old clone.

Description

The tree has small, fastigiate lateral branches forming a narrow, oval head.^[1]

Pests and diseases

The clone's resistance to Dutch Elm Disease is not known, but the species is highly susceptible to the disease and Elm Yellows; it is also moderately preferred for feeding and reproduction by the adult Elm Leaf Beetle Xanthogaleruca luteola ^[2] , and highly preferred for feeding by the Japanese Beetle Popillia japonica ^[3] in the USA. U. americana is also the most susceptible of all the elms to verticillium wilt.^[4]

Cultivation

The tree is not known to have been cultivated beyond the USA.

Etymology

Named in 1927 for a tree grown in Seneca Park, Rochester, New York.

Accessions

North America

Arnold Arboretum. Acc. no. 140-61.

References

1. Green, P. S. (1964). Registration of cultivar names in Ulmus. Arnoldia, Vol. 24. Arnold Arboretum, Harvard University.
2. Miller, F. and Ware, G. (2001). Resistance of Temperate Chinese Elms (Ulmuss spp.) to Feeding of the Adult Elm Leaf Beetle (Coleoptera: Chrysomelidae). Journal of Economic Entomology 94 (1): 162-166. 2001. Entom. Soc.of America.
3. Miller, F., Ware, G. and Jackson, J. (2001). Preference of Temperate Chinese Elms (Ulmuss spp.) for the Feeding of the Japanese Beetle (Coleoptera: Scarabaeidae). Journal of Economic Entomology 94 (2). pp 445-448. 2001. Entom. Soc.of America.
4. Pegg, G. F. & Brady, B. L. (2002). Verticillium Wilts. CABI Publishing. ISBN 0-85199-529-2