Elm tree seedlings grown in U of M nursery in St. Paul. Image credit: John Schoolmeesters.
Background
Dutch elm disease (DED) is a devastating disease that has killed millions of American elm trees in North America. Elms are a keystone species, meaning that they play a vital role in the ecosystem. The combined loss of elm trees and ash trees (due to emerald ash borer) have had significant, detrimental effects in Minnesota.
Dutch elm disease is caused by a fungus (Ophiostoma novo-ulmi) that is spread by elm bark beetles. It is an invasive species that was introduced into the United States in the early 1930s. The fungus triggers reactions that block the tree's vascular system, which prevents it from getting water and nutrients, normally leading to rapid death. However, previous research has proven that there are elm trees in the landscape that are naturally resistant to DED. These resistant trees can show some symptoms of disease, but are ultimately able to recover.
Research goals
- Identify, select, and propagate DED survivor elms from the Minnesota landscape.
- Screen survivor elms for DED resistance.
- Engage in community plantings of DED resistant elms in urban and natural, forested areas.
- Use plant host resistance as an effective tool to manage DED.
Practical implications
Through this work, researchers aim to provide DED-resistant elms that could help to maintain ecological balance, provide habitat for wildlife, and offer shade, aesthetic value, and recreational opportunities for communities in Minnesota. Benefits of DED-resistant elms are very high, especially considering the massive losses of ash trees that have occurred due to emerald ash borer.
Outcomes
This project began in January 2024 and is in progress for the next several years. Please check back at a later time for updates.
To stay connected, sign up for the MITPPC newsletter and follow us on Facebook and LinkedIn.