Table 3.
The treatments and efficacies (4 WAT) of glyphosate plus dicamba combinations applied on GDR and GDS K. scoparia in field conditions.
| Trt* | Herbicide doses | Efficacy# | ||
|---|---|---|---|---|
| Glyphosate | Dicamba | GDR | GDS | |
| ------g ae·ha−1------ | ------%------ | |||
| 2.5 G | 2100 | 0 | 98(2) A | 100 a |
| 2.5 D | 0 | 1400 | 18(5) B | 84(5) b |
| 2.5 G + 1.25 D | 2100 | 700 | 83(6) C | 100 a |
| 2.5 G + 2.5 D | 2100 | 1400 | 78(4) C | 100 a |
| non-treated | 0 | 0 | 0 | 0 |
*2.5 G, 2.5D, and 1.25D represents 2.5 times of glyphosate at label recommended dose (840 g ae·ha−1), 2.5 times of dicamba at label recommended dose (560 g ae·ha−1), and 1.25 times of dicamba at label recommended dose for K. scoparia control, respectively. #Means of visual injury (n = 8), and the values in parentheses are standard error (n = 8). The values followed by different letters are significantly (P-value < 0.05) different among the four treatments within each population according to the Bonferroni’s multiple comparisons test.