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Verticillium Wilt

USDA Forest Service Archive, USDA Forest Service, Bugwood.org
A soil-borne fungus called Verticillium sp. causes a serious vascular disease. The fungi enters a tree through its roots. It attacks ash, barberry, catalpa, elm, magnolia, maple, Russian olive, redbud, smoketree, tuliptree, and viburnum.
Light colored leaves with a dull appearance are seen in early summer. The leaves then begin to wilt and whole branches die. It is primarily a disease of the landscape and not a real problem in the natural forest. 
Good plant health care management practices should help keep the "wilt" away. Once it is present there is no known cure.
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