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 | Erysiphe cichoracearum Erysiphe communis Erysiphe polygoni |
| Southern blight | Sclerotium rolfsii Athelia rolfsii [teleomorph] |
| Smut | Entyloma dahliae |
| Stem and tuber rot | Rhizoctonia solani Thanatephorus cucumeris [teleomorph] |
| Cottony stem rot | Sclerotinia sclerotiorum |
| Vascular wilt | Fusarium oxysporum Verticillium albo-atrum |
| Viral diseases | |
|---|---|
| Mosaic | |
| Dahlia mosaic virus | |
| Ringspot | |