What Diseases Do Geraniums Get

The primary diseases encountered on seedling geraniums are Damping-Off, Pythium Root Rot, Rhizoctonia Root and Crown Rot, and Botrytis Leaf Blight, Crown Rot, and Flower Blight.

How do you treat geranium disease?

Prune off and destroy infected plant parts and keep the soil surrounding the plant clear of any debris. Fungicides may be applied at the first sign of disease to help curtail its spread.

What does geranium rust look like?

Rust on a geranium begins as small, pale yellow circles on the underside of the leaves. These spots quickly grow in size and darken to brown or “rusty” colored spores. Rings of pustules will surround these spots, and pale yellow circles will appear opposite them on the upper sides of the leaves.