A Technical Report from The Bartlett Tree Research Laboratories
Dutch elm disease is one of the most well-known plant diseases in the world. The close relationship between the fungal pathogens Ophiostoma ulmi and O. novo-ulmi (the more recently introduced and more aggressive species) and the elm bark beetle vectors make for a complex disease cycle. The disease entered into the United States inside logs from Europe and has been spread by the beetle vectors and humans to most places where elms grow. All elms native to North America and all European elm species are susceptible to the disease. Dutch elm disease has certainly wreaked havoc on the native American elm, one of the most durable, versatile, and elegant trees found in the United States.
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- I have lived in Braidwood, IL for 10 years and had watched this elm tree grow with our garden. Suddenly, the tree died. My question is what can cause a healthy 40-foot elm tree to suddenly die? The tree is currently covered with flies and moths.
- I have an elm tree (50 years old/approximately 30-40 feet tall) that has leaves that are wilting, partially turning brown, and falling off. What is it and what can be done to save it?