Ryegrass Resistance Levels across Australia
Table 1. The level of resistance in ryegrass detected across the southern Australian wheat-belt. Paddocks were chosen at random without any prior knowledge of the herbicide history. The Victorian and South Australian results are courtesy of Dr Peter Boutsalis and Dr Christopher Preston (The University of Adelaide). The Western Australian results courtesy of Prof Stephen Powles (University of Western Australia) and the NSW results courtesy of John Broster (Charles Sturt University)The data below represents the percentage (%) of paddocks with resistant ryegrass out of the total paddocks that contained ryegrass). Resistance is defined as samples which exhibited ≥ 20% survival to each respective herbicide. nt: not tested.
March 2009 version
|
Region |
Year of survey |
Fields sampled |
Fields with Ryegrass |
Trifluralin (%) |
Hoegrass (%) |
Glean (%) |
Achieve (%) |
Axial (%) |
Select (%) |
|
SA- Mallee |
2007 |
156 |
112 |
19 |
6 |
67 |
2 |
2 |
2 |
|
SA- South East |
2007 |
77 |
54 |
39 |
60 |
69 |
50 |
53 |
41 |
|
SA- Mid North |
1998 |
196 |
167 |
9 |
38* |
22* |
nt |
nt |
19 |
|
SA- Mid North |
2003 |
187 |
163 |
50 |
76 |
75 |
51 |
40 |
36 |
|
Vic- Western Victoria |
2005 |
125 |
112 |
4 |
35 |
57 |
28 |
30 |
12 |
|
Vic- Northern Victoria |
2006 |
118 |
113 |
2 |
40 |
43 |
nt |
34 |
11 |
|
NSW- Southern |
2007 |
181 |
137 |
6 |
81 |
60 |
nt |
nt |
30 |
|
WA- Entire crop zone |
2003 |
503 |
452 |
0.2 |
37 |
68 |
13 |
nt |
0.5 |
