| Date | 1866 |
| Author | Woronin |
| Contribution | Concluded (erroneously, because of knowledge then available) that bacteria in plant root nodules were pathogenic. |
| Reference | Lechevalier |
| Notes | Observation on lupine root nodules. Similar observation by Lachmann in 1858. The role of bacteria in nitrogen fixation in leguminous plants had yet to be discovered. |
| Category | Causation |
| Pathogen Class | Bacteria |
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