TABLE 2.
Parameters of the log-logistic equation of the dose–response regression curves of survival and fresh weight in G. coronaria S and R (R1 and R2) populations in presence and absence of malathion.
| Herbicide | Malathion | Population | LD50/ED50 (g a.i./ha)a | Slope | RI | |
| % Survivals | Tribenuron | + | S | 1.7 | −1.7 | – |
| R1 | >300 | – | >300 | |||
| R2 | >300 | – | >300 | |||
| − | S | 1.7 | −2.4 | – | ||
| R1 | >300 | – | >300 | |||
| R2 | >300 | – | >300 | |||
| Imazamox | + | S | 8.0 | −1.8 | – | |
| R1 | 49.5 | −3.0 | 6.2* | |||
| R2 | 49.9 | −2.8 | 6.2** | |||
| − | S | 8.3 | −3.0 | – | ||
| R1 | 63.8 | −3.4 | 7.9** | |||
| R2 | 69.7 | −3.1 | 8.7* | |||
| Florasulam | − | S | 0.6 | −0.9 | – | |
| R1 | 5.2 | −0.9 | 8.4*** | |||
| R2 | 10.2 | −1.7 | 16.5*** | |||
| % Fresh weight | Tribenuron | + | S | 0.8 | 1.8 | – |
| R1 | >300 | – | >300 | |||
| R2 | >300 | – | >300 | |||
| − | S | 1.4 | 2.7 | – | ||
| R1 | >300 | – | >300 | |||
| R2 | >300 | – | >300 | |||
| Imazamox | + | S | 6.5 | 2.2 | – | |
| R1 | 20.8 | 1.6 | 3.19*** | |||
| R2 | 24.8 | 1.7 | 3.81*** | |||
| − | S | 5.6 | 2.4 | – | ||
| R1 | 27.7 | 1.6 | 4.25*** | |||
| R2 | 21.1 | 1.4 | 3.24*** | |||
| Florasulam | − | S | 0.5 | 1.3 | – | |
| R1 | 2.2 | 0.9 | 4.67*** | |||
| R2 | 4.0 | 1.1 | 8.66*** |
RI, resistance index. *P = 0.05, **P = 0.01, ***P = 0.001. aLD50/ED50 represent the herbicide concentrations required to decrease by 50% the survival (%) and fresh weight (%) of G. coronaria, respectively.