| 5446329 |
powdery mildew |
Erysiphe betae |
close-up of mycelium patch of powdery mildew of sugar beet showing conidiophores |
| 1571083 |
powdery mildew |
Erysiphe betae |
Underside of leaf showing powdery mildew caused by Erysiphe polygoni. March 1995 |
| 1571084 |
powdery mildew |
Erysiphe betae |
Close-up of underside of leaf showing powdery mildew caused by Erysiphe polygoni. March 1995 |
| 1571086 |
powdery mildew |
Erysiphe betae |
Close-up of sugar beet leaf showing powdery mildew caused by Erysiphe polygoni. March 1995 |
| 1571089 |
powdery mildew |
Erysiphe betae |
A single powdery mildew (caused by Erysiphe polygoni) lesion on the underside of a sugar beet leaf. March 1995 |