The Arboretum is the home of Ontario's Elm Recovery Project [1] which is designed to capture the Dutch Elm Disease tolerant genes in Ontario for breeding purposes. We are interested in the characteristics and location of all Ontario elms that are greater than 213 cm, or 7 feet in circumference. 

All elms get Dutch elm disease infections and certain individuals have a strong enough immune system to fight it off. All trees die at some point in time however, due to age, drought or other stresses that compromise the immune system enough that Dutch Elm Disease finally takes over. Treatment is possible (and costly) but is not a long term cure. You can contact an Arborist through http://www.isaontario.com [2] to do the treatment work.