| Peronospora | genus of destructive downy mildews |
|---|---|
| Peronospora | fungus causing a downy mildew on onions |
| Peronospora | fungus causing a downy mildew on growing tobacco |
| Peronospora | fungus causing a serious disease in tobacco plants characterized by bluish-gray mildew on undersides of leaves |
| Peronospora | parasitic fungi: downy mildews |
| Peronospora | order of chiefly parasitic lower fungi: Albuginaceae and Peronosporaceae and Pythiaceae |