| Date | 1857 |
| Author | Speerschneider |
| Contribution | Demonstrated contagiousness of potato blight fungus. |
| Reference | Parris |
| Notes | J. Speerschneider. Showed contagiousness from diseased leaf to healthy tuber. See Berkeley and deBary entries. |
| Category | Causation |
| Pathogen Class | Fungi |
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