| Control | ||||||
| Herbicide Treatment | Rate g∙ai∙ha−1 | Timing | 4 WAA | 8 WAA | Density | Dry weight |
| % | # m−2 | g∙m−2 | ||||
| Weedy check | 0 d | 0 d | 10.6 c | 37.5 c | ||
| Weed-free check | 100 a | 100 a | 0.0 a | 0.0 a | ||
| Halosulfuron | 17.5 | PPI | 96 ab | 97 b | 1.2 b | 1.6 ab |
| Halosulfuron | 35 | PPI | 98 ab | 99 ab | 0.2 ab | 0.9 ab |
| Halosulfuron | 70 | PPI | 95 ab | 100 a | 0.5 ab | 1.5 ab |
| Halosulfuron | 17.5 | PRE | 83 b | 96 b | 2.0 b | 4.7 b |
| Halosulfuron | 35 | PRE | 87 b | 99 ab | 1.5 b | 3.4 ab |
| Halosulfuron | 70 | PRE | 93 ab | 99 ab | 0.7 ab | 2.6 ab |
| Halosulfuron | 17.5 | POST | 44 c | 42 c | 9.5 c | 72.3 c |
| Halosulfuron | 35 | POST | 36 c | 41 c | 10.7 c | 48.9 c |
| Halosulfuron | 70 | POST | 51 c | 47 c | 9.4 c | 52.1 c |