The graceful American elm that once dominated urban forests across the United States has essentially disappeared from urban landscapes after the introduction of Dutch elm disease. This tragedy illustrates why it is essential to maximize genetic diversity within the nation’s urban forests. Exotic pathogens and insects continue to threaten the health of our shade trees. Dutch elm disease-resistant elm cultivars could enhance the diversity as well as the beauty of urban forests. Although many Dutch elm disease-resistant elm cultivars are available in the nursery trade, much of the public is hesitant to purchase and plant any elm tree. In order to promote interest in planting these trees, scientific data on growth, form, and pest resistance for existing Dutch elm disease resistant elm cultivars are essential.
Iowa State University
Gleason, Mark L. and Batzer, Jean C., "National Elm Trial Update for Iowa, 2007" (2008). Iowa State Research Farm Progress Reports. 698.