Dutch elm disease (DED) is one of the most commonly known and destructive tree diseases in the world. The disease was first observed in Ohio in 1930, and by 1976, only 34 million of the estimated 77 million elms present in U.S. urban locations remained.

Research on American elm from the 1970s to the present has focused in large part on the identification of American elm individuals that can withstand the DED pathogen. To increase American elm’s long-term recovery as a canopy tree, it is crucial to increase the genetic variation of tolerant elms available for planting in urban and rural settings.

Related Research:

Scientists:

Jennifer Koch, Research Biologist, Northern Research Station, Delaware, Ohio
Kathleen Knight, Research Ecologist, Northern Research Station, Delaware, Ohio
Denny Townsend, Research Geneticist (Retired), USDA ARS, U.S. National Arboretum, Washington, D.C.
Dale Lesser, Farmer, Lesser Farms and Orchard, Dexter, Michigan

Produced by the USDA Forest Service Northern Research Station.

Want more information? Visit us at https://www.fs.usda.gov/research/nrs/products/multimedia/podcasts/forestcast-season-2-backcross-episode-4-return-elm-street

Questions or ideas for the show? Connect with Jon at: jonathan.yales@usda.gov

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Backcross: A Return to Elm Street