This article is a list of diseases of dahlia (Dahlia sp.).
| Bacterial diseases | |
|---|---|
| Bacterial wilt | Pseudomonas solanacearum |
| Crown gall | Agrobacterium tumefaciens |
| Fungal diseases | |
|---|---|
| Flower blight | Botrytis cinerea |
| Leaf spot | Alternaria alternata |
| Powdery mildew | |
| Southern blight | Sclerotium rolfsii |
| Smut | Entyloma dahliae |
| Stem and tuber rot | Rhizoctonia solani |
| Cottony stem rot | Sclerotinia sclerotiorum |
| Vascular wilt | |
| Viral diseases | |
|---|---|
| Mosaic | Cucumber mosaic virus (CSV), Dahlia mosaic virus (DMV) |
| RNA virus | Tobacco streak virus (TSV) |
| Ringspot | Impatiens necrotic spot virus (INSV), Tomato spotted wilt virus (TSWV) |