Improving the efficacy of clethodim herbicide against annual ryegrass

2012

Research organisatons
Funding source

Trial details

Researcher(s) Sam Kleemann, Chris Preston, Gurjeet Gill, Peter Boutsalis (UoA) and Peter Hooper (Hart)
Year(s) 2012
Contributor Hart Field Site Group
Trial location(s) Site 5, Hart, SA
Improving the efficacy of clethodim herbicide against annual ryegrass locations
Aims

To investigate the factors influencing (i.e. ryegrass size) performance of ‘dim’ herbicides Select (a.i. clethodim) & Factor (a.i. butroxydim) on Group A resistant ryegrass in canola.

Key messages
  • Clethodim applied at 500ml/ha to ryegrass at the 2 to 3 leaf stage averaged 84% control.
  • Two early applications, ryegrass at 2 to 3 leaf and then again 3 weeks later, gave the best control of resultant ryegrass head numbers.
  • All combinations of clethodim and butroxydim applied after ryegrass reached the 2 to 3 leaf stage significantly reduced grain yield.
Lead research organisation School of Agriculture, Food and Wine - The University of Adelaide
Host research organisation Hart Field Site Group
Trial funding source GRDC
Related program N/A
Acknowledgments

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


Other trial partners Hart Field Site Group
Download the trial report to view additional trial information

Method

Crop type Canola
Treatment type(s)
  • Crop
  • Herbicide
  • Herbicide: Type
Trial type Experimental
Trial design Randomised,Replicated,Blocked

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
Fertiliser

DAP Zn 2% @ 80kg/ha

Download the trial report to view additional method/treatment information

Download results

Trial results Hart

@T1: @T2: @T3: @T4:
# Treatment 1
Plant density (plants/m2) Plant density (plants/m2) Plant density (plants/m2) Head abundance (heads/m2)
1 clethodim 500ml 53 50 57 91
1 clethodim + butroxydim 500ml + 80g 45 47 49 118
1 clethodim 500ml Ryegrass 2-3 leaf 32 6 11 14
1 clethodim + butroxydim 500ml + 80g Ryegrass 2-3 leaf 35 4 5 4
2 clethodim 500ml 3 weeks after ryegrass 2-3 leaf 43 28 12 33
2 clethodim + butroxydim 500ml + 80g 3 weeks after ryegrass 2-3 leaf 50 37 6 8
2 clethodim 500ml 6 weeks after ryegrass 2-3 leaf 47 39 56 66
2 clethodim + butroxydim 500ml + 80g 6 weeks after ryegrass 2-3 leaf 52 51 49 36
3 clethodim 500ml Ryegrass 2-3 leaf + 3 weeks after ryegrass 2-3 leaf 36 10 6 5
3 clethodim + butroxydim 500ml + 80g Ryegrass 2-3 leaf + 3 weeks after ryegrass 2-3 leaf 48 4 2 0
3 clethodim 500ml Ryegrass 2-3 leaf + 6 weeks after ryegrass 2-3 leaf 35 46 10 25
3 clethodim + butroxydim 500ml + 80g Ryegrass 2-3 leaf + 6 weeks after ryegrass 2-3 leaf 41 51 8 5
4 clethodim + UAN 500ml + 20L Ryegrass 2-3 leaf + 3 weeks after ryegrass 2-3 leaf 46 5 3 10
4 clethodim + butroxydim 500ml + 80g + + UAN 20L Ryegrass 2-3 leaf + 3 weeks after ryegrass 2-3 leaf 44 3 1 1
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Head abundance heads/m2


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Plant density plants/m2


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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

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Climate

Site 5, Hart SA 2012


Observed climate information

Rainfall trial gsr (mm) 168mm

Derived climate information

Site 5, Hart 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 last modified: 09-12-2019 10:14am AEST