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Management of group A herbicide resistant barley grass in pasture phase

2016

Research organisations
Funding source
SARDI Minnipa Agricultural Centre School of Agriculture, Food and Wine - The University of Adelaide
<abbr title='Grains Research and Development Corporation'>GRDC</abbr>

Trial details

Researcher(s) Amanda Cook (SARDI)
Ben Fleet (University of Adelaide)
Gurjeet Gill (University of Adelaide)
Christopher Preston (SARDI)
Year(s) 2016
Contributor SARDI Minnipa Agricultural Centre
Trial location(s) Minnipa Agricultural Centre, SA
Management of group A herbicide resistant barley grass in pasture phase locations
Aims
  • To investigate legume pasture options for controlling group A (ACCase inhibitors) resistant barley grass (GRDC project UA00149).
  • The trial also looked at the impact of these pasture treatments on a subsequent wheat crop and compared one vs. two consecutive years of legume pasture on barley grass management in the absence of group A herbicides.
Key messages
  • At present, group A herbicide resistance in barley grass is relatively low at a district level on the EP. However, growers need to act now to integrate multiple control tactics to prolong the effectiveness of these cheap and effective herbicides.
  • In the absence of group A herbicides, it is still possible to achieve large reductions in barley grass seed bank in a legume pasture phase.
  • When using moderate efficacy-low cost herbicides (Treflan + Logran) for barley grass control in wheat, effective control of the weed in previous pasture phase was critical.
Lead research organisation School of Agriculture, Food and Wine - The University of Adelaide
Host research organisation N/A
Trial funding source GRDC UA00149
Related program N/A
Acknowledgments

The authors would like to thank GRDC for funding this trial (UA00149). Also Malinee Thongmee and Ryan Garnett’s efforts towards seed bank sampling and assessment and Katrina Brands for running grain quality tests.
Other trial partners Not specified
Download the trial report to view additional trial information

Method

Crop types Pasture: Medic Hay: Vetch
Treatment type(s)
  • Grazing : Timing
  • Herbicide : Timing
  • Herbicide : Type
Trial type Experimental
Trial design Randomised,Replicated,Blocked

Minnipa Agricultural Centre 2016 Medic

Sow date 26 May 2016
Harvest date Not specified
Plot size 9m x 9m
Plot replication 4
Herbicide

Table 1 Pasture treatments in 2015

2015 Pasture barley grass management treatments

1

Brown manure vetch – vetch was sown and brown manured with glyphosate (570 g/L) @ 1.5 L/ha (4 September)

2

Medic (regen.) pasture topped early – topped with glyphosate (570 g/L) @ 0.5 L/ha when 10% barley grass seed was at soft dough stage (4 September)

3

Medic (regen.) pasture topped mid – topped with paraquat @ 1 L/ha when 50% barley grass seed was at soft dough stage (15 September)

4

Medic (regen.) hay cut – (29 September)

5

Medic (regen.) glyphosate + hay cut – topped with glyphosate (570 g/L) @ 2.4 L/ha (24 September) followed by hay cut (29 September)

6

Medic (regen.) propyzamide – applied at 1 L/ha EPE (8 May), note applied when medic had germinated but prior to significant barley grass germination

7

Medic (regen.) propyzamide + spray topped mid – propyzamide @ 1 L/ha EPE (8 May), paraquat @ 1 L/ha when 50% barley grass seed at soft dough stage (15 September)

8

Medic (regen.) grazed (control) – grazing simulated by mowing (20 August)

Minnipa Agricultural Centre 2016 Vetch

Sow date Not specified
Harvest date Not specified
Plot size Not specified
Plot replication Not specified
Herbicide Not specified
Download the trial report to view additional method/treatment information
Trial source data and summary not available
Check the trial report PDF for trial results.
Observed trial site soil information
Trial site soil testing
Not specified
Soil conditions
Trial site Soil texture
Minnipa Agricultural Centre, SA Red loam
Derived trial site soil information
Australian Soil Classification Source: ASRIS
Trial site Soil order
Minnipa Agricultural Centre, SA Calcarosol
Soil Moisture Source: BOM/ANU
Average amount of water stored in the soil profile during the year, estimated by the OzWALD model-data fusion system.
Year Minnipa Agricultural Centre SA
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Climate

Minnipa Agricultural Centre SA 2016

Observed climate information

Rainfall avg ann (mm) 325mm
Rainfall avg gsr (mm) 241mm
Rainfall trial total (mm) 391mm
Rainfall trial gsr (mm) 268mm

Derived climate information

Minnipa Agricultural Centre SA

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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.

Trial report and links

2016 trial report



Trial last modified: 08-10-2019 14:38pm AEST