| Factor | FOT (h) | Log spores/ml | SE (%) |
| T | 66 | 9.18c | 36.3c |
| N | 69 | 9.40b | 67.5b |
| S | 66 | 9.87a | 95.2a |
| HO | 73 | 9.02cd | 26.4d |
| Control | 66 | 8.98d | 35.6cd |