Green ash is a widely planted shade tree throughout Minnesota.
Several diseases of ash can render them very unsightly, weakening or even killing them. Trees can suffer from a many diseases but a few relatively common diseases on green ash in Minnesota include ash anthracnose, Verticillium wilt and ash yellows. Insect damage, salt damage and other stresses such as drought sometimes resemble disease symptoms, and vice versa. To avoid confusion and provide accurate treatment options, knowledge of the organism is necessary. Confirmation of the causal agent by a lab or plant pathology consultant is suggested.