Management of herbicide resistant barley grass in pulse crops

2012

Research organisatons
Funding source

Trial details

Researcher(s) Ben Fleet, Lovreet Shergill, Gurjeet Gill (University of Adelaide) and Barry Mudge (UNFS)
Year(s) 2012
Contributor Upper North Farming Systems
Trial location(s) Baroota, SA
Management of herbicide resistant barley grass in pulse crops locations
Aims

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.

Key messages
  • Increasing incidence of barley grass in cropping paddocks in southern Australia is likely to be associated with selection of more dormant biotypes by weed management practices used by growers.
  • In some districts, barley grass management is now being complicated by the evolution of group A resistance. However, there appear to be several effective potential herbicide alternatives for barley grass control in broadleaf crops.
  • Integrated weed management strategies are critical to delay onset of herbicide resistant barley grass.
Lead research organisation University of Adelaide
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
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Method

Crop type Field peas
Treatment type(s)
  • Herbicide: Type
Trial type Experimental
Trial design Replicated

Baroota 2012

Sow date Not specified
Harvest date Not specified
Plot size Not specified
Plot replication Not specified
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Download results

Trial results Table 1

@T1: % Seedset reduction
# 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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Grain yield t/ha


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Reduction in plants %


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Observed trial site soil information
Trial site soil testing
Not specified
Soil conditions
Trial site Soil texture
Baroota, SA Not specified
Derived trial site soil information
Australian Soil Classification Source
Trial site Soil order
Baroota, SA Chromosol
National soil grid Source
NOTE: National Soil Grid data is aggregated information for background information on the wider area
Actual soil values can vary significantly in a small area and the trial soil tests are the most relevant data where available

Soil properties

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Climate

Derived climate information

No observed climate data available for this trial.
Derived climate data is determined from trial site location and national weather sources.

Baroota SA

NOTE: Exact trial site locality unknown - Climate data may not be accurate
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Some data on this site is sourced from the Bureau of Meteorology

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.




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Trial last modified: 09-07-2019 16:22pm AEST