Match the columns:
| Column I | |
| Column II | |
| P. Fusarium oxysporum | 1. Root rot of sweet potato |
| Q. Ustilago tritici | 2. Wilt of cotton |
| R. Claviceps purpurea | 3. Loose smut of wheat |
| S. Rhizopus stolonifer | 4. Ergot of rye |
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