| Host genus | Fungal species | Symptoms and notes |
| Bellis | Puccinia obscura | Rust on leaves |
| Septoria bellidis | Conidiomata found on brown leaf spots | |
| Betula | Anisogramma virgultorum | Forms cankers in young twigs, shoot and crown dieback |
| Atopospora betulina | Causes small tar spots on leaves | |
| Erysiphe europaea | Powdery mildew of leaves | |
| Melampsoridium betulinum | Rust on leaves (uredinia and telia) | |
| Splanchnonema scoriadeum | A weak parasite of twigs and branches, probably causing dieback but not seriously harming the tree | |
| Xenotypa aterrima | Stromata develop between the cambium and periderm of small branches, breaking through the surface layers when mature. Pathogenic nature unknown. | |
| Buxus | Geejayessia cicatricum | Associated with dieback of small twigs (possibly not the causal organism) |