As the same tree species or those that are closely related spread out their roots in the ground, they come in contact with each other. Increase demand for these trees will grow when research shows these elms will survive disease pressure and once again can fill an important niche in landscapes that was lost to Dutch elm disease. By 1960, Dutch elm disease had spread to the Chicago area and by 1989, more than 75 percent of elm trees in the U.S. had been lost to the disease. Half a century ago Britain’s elm population stood at nearly 30 million but was massacred to fewer than 100 after Dutch elm disease spread across the country. Dutch elm disease is a highly destructive disease of several species of elm (trees in the Ulmus genus). Quick facts. Dutch elm disease may also be spread from tree to tree if the roots of an infected tree are touching the roots of a healthy tree. Over time, those roots from different trees can graft or fuse together. Dutch elm disease (DED) affects American elms (Ulmus americana), red elms (U. rubra) and rock elms (U. thomasii) throughout Minnesota. Researchers have been working to breed and select DED-resistant trees to replace diseased trees. When these beetles move to other elms to feed or over-winter under the bark at the base of an elm, they can infect healthy elms. The fungus is spread from tree to tree by elm bark beetles. Signs of Dutch elm disease come on rapidly, over about a month’s time, typically in the spring when leaves are just maturing. For more information on Dutch elm disease, contact Michigan State University Extension ’s Garden and Landscape Hotline at 888-678-3464. https://www.thespruce.com/dutch-elm-disease-on-american-elm-trees-2131195 One or more branches will be covered in yellow, wilted leaves that soon die and fall from the tree. It is caused by two related fungi, Ophiostoma novo-ulmi and Ophiostoma ulmi, although almost all cases are now caused by O. novo-ulmi. Another way Dutch elm disease spread is through root grafts. Dutch elm disease (DED) is caused by a fungus called Ophiostoma ulmi (formerly Ceratocystis ulmi) that was introduced to the U.S. in the early 1930s. The disease is still a threat today, but fortunately, several resistant American elm and hybrid elm selections are available or being developed. Q. The Dutch elm disease fungus can move from an infected tree to neighboring trees through their interconnected roots (or root grafts). Dutch Elm Disease is a tree affliction caused by a fungus that clogs up the vascular system of elm trees, restricting flow of sap, and usually killing the tree within one to three years of infection. The fungus is transmitted from tree to tree by interconnected root systems and by elm bark beetles. How to Detect Dutch Elm Disease. DED is one of the most widely-known tree diseases, worldwide. 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