Elm Research Institute
- Nonprofit organization dedicated to the restoration of the American elm tree, Ulmus americana. Includes information about Dutch elm disease and the American Liberty elm, a group of cultivars with resistance to this fungal disease.
- http://www.landscapeelms.com

The American Chestnut Foundation
- Dedicated to the restoration of the American Chestnut through scientific breeding and cooperative research.
- http://www.acf.org/

Saskatchewan Dutch Elm Disease Association
- The SDEDA is an association created to preserve the American Elm in Saskatchewan. Provides information on Dutch Elm Disease and ways to battle the disease.
- http://www.sdeda.ca/

Elmcare.com
- Devoted to elm trees and elm care with sections dealing with diseases (including Dutch elm disease), new research, tree physiology and other elm-related information.
- http://www.elmcare.com

The Canadian Chestnut Council
- Charitable organization to promote the American chestnut: organization and biological news.
- http://www.uoguelph.ca/~chestnut/