University of Maryland Extension

Invasive Diseases

An invasive species is a non-native species whose introduction causes or is likely to cause economic harm, environmental harm, or harm to human health.

beech tree with beech bark disease
Beech bark disease


row of infected boxwood
Boxwood Blight

Impatiens downy mildew symptom
Impatiens downy mildew

branch infected with oak wilt
Oak wilt

sudden oak death symptoms on stem and leaves
Sudden oak death


thousand canker dieback on walnut tree
Thousand cankers disease

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