Ulmus parvifolia 'Pathfinder' explained

Ulmus parvifolia 'Pathfinder'
Species:	Ulmus parvifolia
Cultivar:	'Pathfinder'
Origin:	US

The Chinese Elm cultivar Ulmus parvifolia 'Pathfinder' is another development by A. M. Townsend of the USDA National Arboretum registered in 1990.

Description

The tree is of modest proportions, rarely reaching > 11 m in height, with a crown slightly less in diameter. The leaves are a glossy yellow-green, and variously described as turning 'grayish red' or 'brilliant red' in autumn. The trunk sports the typical mottled bark.^{[1] [2]}

Pests and diseases

The species and its cultivars are highly resistant, but not immune, to Dutch elm disease, and unaffected by the Elm Leaf Beetle Xanthogaleruca luteola.^[3] However, tolerance of Elm Yellows in the USA was found to be poor. ^[4]

Cultivation

'Pathfinder' is not known to be in cultivation beyond North America.

Accessions

North America

• Arnold Arboretum, US. Acc. no. 135-98

External links

• http://www.ces.ncsu.edu/depts/hort/consumer/factsheets/trees-new/cultivars/ulmus_parvifolia.htm Ulmus parvifolia cultivar list.

Notes and References

1. Amer. Nurseryman, 175(4): 42, 1992.
2. Spongberg, S. A. (1991), HortScience 26: 476, 1991.
3. Web site: Elm Leaf Beetle Survey. 17 July 2017. https://web.archive.org/web/20110719132152/http://www.sunshinenursery.com/survey.htm. 2011-07-19.
4. Sinclair, W. A., Townsend, A. M., Griffiths, H. M., & Whitlow, T. H. (2000). Responses of six Eurasian Ulmus cultivars to a North American elm yellows phytoplasma. Plant disease, Vol. 84, No.12, 1266-1270. American Phytopathological Society, St. Paul, MN