| Host genus | Fungal species | Symptoms and notes |
| Quercus | Erysiphe alphitoides | Powdery mildew of leaves |
| Microstroma album | Causes "frosty mildew" of leaves; apparently causing little damage |
| Host genus | Fungal species | Symptoms and notes |
| Quercus | Erysiphe alphitoides | Powdery mildew of leaves |
| Microstroma album | Causes "frosty mildew" of leaves; apparently causing little damage |