Control of clethodim resistant ryegrass with pre-emergent herbicides


Research organisaton
Funding source

Trial details

Researcher(s) Sam Kleemann, Chris Preston, Gurjeet Gill and Peter Boutsalis (UoA) and Peter Hooper (Hart)
Year(s) 2012
Contributor Hart Field Site Group
Trial location(s) Site 5, Hart, SA
Control of clethodim resistant ryegrass with pre-emergent herbicides locations

To investigate various pre-emergent options to improve the control of Group A resistant ryegrass in canola.

Key messages
  • Measurements in August showed clethodim to give 82% control and pre-emergent treatments to give 85% control of annual ryegrass.
  • Averaged across the trial the ryegrass still set 15 heads per square metre.
Lead research organisation Hart Field Site Group
Host research organisation Hart Field Site Group
Trial funding source GRDC
Related program N/A

This trial was funded by GRDC & conducted in collaboration with Hart & Birchip Cropping Groups & The University of Adelaide.

Other trial partners BCG and The University of Adelaide
Download the trial report to view additional trial information


Crop type Canola
Treatment type(s)
  • Crop
  • Crop: Type
  • Herbicide
  • Herbicide: Type
  • Herbicide: Timing
Trial type Experimental
Trial design Replicated

Hart 2012

Sow rate or Target density Clearfield canola
Sow date 31 May 2012
Harvest date Not specified
Plot size 1.75m x 12m
Plot replication Not specified

DAP Zn 2% @ 80kg/ha

Download the trial report to view additional method/treatment information

Download results

Trial results Table 1

# Treatment 1
Plant density (plants/m2)
1 Trifluralin 480 1.5L/ha + tri-allate 3.0L/ha (IBS) 5
2 Experimental 1 (IBS) 3
3 Outlook 1.0L/ha (IBS) 5
4 Outlook 0.7L/ha (IBS) + 0.5L/ha (PSPE) 2
5 Propyzamide 1.0kg/ha 50% (IBS) + 50% (PSPE) 3
6 Propyzamide 1.0kg/ha 50% (PSPE) + 50% (3-4 leaf) + clethodim 0.5L/ha (POST) 26
7 Propyzamide 1.0kg/ha (PSPE – before rain) 22
8 Propyzamide 1.0kg/ha (3-4 leaf) + clethodim 0.5L/ha (POST) 50
9 Dual Gold 0.5L/ha 50% (IBS) + 50% (PSPE) 9
10 Dual Gold 0.5L/ha 50% (PSPE) + 50% (3-4 leaf) + clethodim 0.5L/ha (POST) 41
11 Dual Gold 0.5L/ha (PSPE – before rain) 33
12 Dual Gold 0.5L/ha (3-4 leaf) + clethodim 0.5L/ha (POST) 34
13 Clethodim 0.5L/ha (POST) 32
14 Butroxydim 180g/ha (POST) 38
15 Clethodim 0.5L/ha + butroxydim 180g/ha (POST) 39

Plant density plants/m2

Observed trial site soil information
Trial site soil testing
Not specified
Soil conditions
Trial site Soil texture
Site 5, Hart, SA Calcarosol
Derived trial site soil information
Australian Soil Classification Source
Trial site Soil order
Site 5, Hart, 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



Site 5, Hart SA 2012

Observed climate information

Rainfall trial gsr (mm) 168mm

Derived climate information

Site 5, Hart SA


Some data on this site is sourced from the Bureau of Meteorology

SILO weather estimates sourced from
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 last modified: 06-06-2019 10:30am AEST