University of Maryland Extension

Fungal Diseases

Fungi are filamentous organisms that are for the most part microscopic, although some produce large structures such as toadstools or mushrooms. Approximately 100,000 fungal species have been described and most of them are beneficial or benign. Only about 8,000 fungal species cause plant diseases.

Click on an image below to learn more about fungal diseases commonly found in Maryland.

black spot  botrytis on petunia
Black spot Botrytis (gray mold)
botryosphaeria on rhododendron
Botryosphaeria Canker Brown rot of cherries
 cytospora canker anthracnose dogwood
  Cankers (general) Dogwood anthracnose
sycamore anthracnose  dutch elm disease
Shade tree anthracnose Dutch elm disease
  needle cast disease 
Ivy leaf spot Needle cast diseases
 powdery mildew cedar apple rust gall
  Powdery mildews Rust diseases (Cedar-apple rust)
Southern blight on sage soybean rust 
Southern blight Soybean Rust
verticillium voultella on boxwood
 Verticillium Volutella of Boxwood
Volutella of Pachysandra
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