Researcher(s) |
Ben Fleet (University of Adelaide) Gurjeet Gill (University of Adelaide) Barry Mudge (UNFS) Lovreet Shergill (University of Adelaide) |
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Year(s) | 2012 |
Contributor | Upper North Farming Systems |
Trial location(s) |
Baroota, SA
|
Presence of increased seed dormancy in this grass weed species has enabled it to escape pre-sowing control tactics used by the growers. This explains why barley grass is a problematic weed in cereal crops. However, in some locations like Port Germein and Baroota districts, it has now become largely impossible to control in pulse crops. This islikely due to the presence of group A (fop & dim) herbicide resistance. Currently in these locations barley grass control is reliant on growing Clearfield wheat and the use of imidazolinone (group B) herbicides. This management strategy is at high risk of collapsing from the additional development of group B herbicide resistance. Previous studies have shown that resistance to group B herbicides can develop relatively quickly. Presence of large densities and repeated exposure to group B herbicides could rapidly lead to group B resistance in such barley grass populations. The extent of this resistance needs to be understood and effective management strategies to manage resistant barley grass in pulse crops developed.
Lead research organisation |
University of Adelaide |
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Host research organisation |
Upper North Farming Systems |
Trial funding source | GRDC UA00105 |
Related program | N/A |
Acknowledgments |
Rupinder Saini, Amrit Riar and Malinee Thongmee for their technical assistance. Rob Dennis, for providing the field trial site and sowing the peas |
Other trial partners | Not specified |
Crop type | Grain Legume: Field peas |
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Treatment type(s) |
|
Trial type | Experimental |
Trial design | Replicated |
Sow date | Not specified |
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Harvest date | Not specified |
Plot size | Not specified |
Plot replication | Not specified |
Other trial notes |
Barley grass, like annual ryegrass, has the capacity to become highly resistant to group A herbicides (Figure 1). Even though resistance takes longer to develop in barley grass, its proactive resistance management is still vital. An integrated weed management strategy, combining multiple control tactics to reduce seed set, is required to delay the development of herbicide resistance. For example in a non-group A resistant population, pre-emergent herbicide + post-emergent group A herbic |
@T1: % Seedset reduction | |||
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# |
Treatment 1
|
Grain yield (t/ha) | Reduction in plants (%) |
1 | █ Sakura @ 118 g/ha IBS | 2.29 | 99 |
1 | █ Boxer Gold @ 2.5 L/ha IBS | 1.41 | 74 |
2 | █ Outlook @ 1 L/ha IBS | 2.14 | 93 |
2 | █ Raptor @ 45 g/ha + BS1000 0.2% PE | 2.08 | 100 |
3 | █ Trifluralin @ 2.0 L/ha + Avadex Xtra @ 2L/ha | 1.32 | 71 |
3 | █ Metribuzin @ 200 g/ha PSPE | 0.82 | 46 |
4 | █ Propyzamide 500 @ 1.5 L/ha | 2.29 | 100 |
4 | █ Diuron 900@ 1 kg/ha + Trifluralin @ 2.0 L/ha IBS | 1.58 | 78 |
5 | █ Trifluralin 2.0 L/ha IBS | 1.19 | 68 |
5 | █ Control | 0.82 | - |
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10 | █ |
SILO weather estimates sourced from https://www.longpaddock.qld.gov.au/silo/
Jeffrey, S.J., Carter, J.O., Moodie, K.B. and Beswick, A.R. (2001). Using spatial interpolation to construct a comprehensive archive of Australian climate data , Environmental Modelling and Software, Vol 16/4, pp 309-330. DOI: 10.1016/S1364-8152(01)00008-1.