Mullewa trials - herbicides for selective spot spraying application on winter weeds in chemical fallow


Research organisaton

Trial details

Researcher(s) Grant Thompson (Crop Circle Consulting)
Year(s) 2010
Contributor North East Farming Futures
Trial location(s) Tenindewa, WA
Mullewa trials - herbicides for selective spot spraying application on winter weeds in chemical fallow locations
  • To assess herbicide treatments on mixed winter weeds in an early / long spray fallow.
  • To identify alternative herbicides to control weeds that have or are developing resistance to traditional herbicides used in winter weed control.
  • To identify possible alternative herbicide mixtures that could be effective in a low area selective spot spraying scenario with weed seeker technology.
  • To identify other modes of action for control of resistant weeds other than Glyphosate.
Key messages
  • Weed sensing and selective spot spraying with machinery such as the WEEDSEEKER and WEED-IT selective spot sprayers has allowed for very cost effective broadacre spot spraying of weeds without spraying the whole paddock area.
  • Selective spot spraying of hard to kill summer weeds is one application where this technology has a potential to save growers significant funds usually allocated to herbicides.
  • Elevated rates of non-traditional or previously cost prohibited herbicides of a different resistance group can now be used to achieve much more reliable and faster control of herbicide resistant weeds.
  • Robust rates of Glyphosate provided the most acceptable levels of control across the 3 winter weeds species tested.
  • Gramoxone and Sprayseed at rates of 2L & 4L gave good control of brome grass, but both annual ryegrass and wild radish grew back and at the final ratings showed unacceptable levels of control.
  • In a region where Glyphosate tolerant ryegrass populations have been identified, the lack of alternative modes of action to reliably control annual ryegrass and wild radish in fallow is of real concern.
Lead research organisation North East Farming Futures
Host research organisation N/A
Related program N/A
  • Tim & Daniel Critch- Wyalong Pastoral Co,Teninddewa
  • Grant Thompson, Crop Circle Consulting
  • Peter Newman – DAFWA
  • Wyalong Pastoral Co – Tim and Daniel Critch
  • Peter Bostock – Landmark.
  • GRDC - A Western Region Agribusiness Extension Project

Other trial partners Not specified
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Crop type No crop specified
Treatment type(s)
  • Herbicide: Type
Trial type Experimental
Trial design Unknown

Tenindewa 2010

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

Glyphosate 450 g/L, Gramoxone 250g/L, Basta, Alliance, Ally, Grazon, Hammer, Estericide 680, Hotshot, Stiker, Sprayseed, Atrazine 600g/L, Glean, BS1000 wetting agent.

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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
Tenindewa, WA Not specified
Derived trial site soil information
Australian Soil Classification Source: ASRIS
Trial site Soil order
Tenindewa, WA Kandosol
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 Tenindewa WA
2010 74.0mm
2009 85.4mm
2008 116.2mm
2007 94.2mm
2006 76.9mm
2005 83.6mm
2004 71.1mm
2003 72.7mm
2002 59.8mm
2001 30.6mm
2000 95.1mm
National soil grid Source: CSIRO/TERN
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



Derived climate information

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

Tenindewa WA


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 report and links

2010 trial report

Trial last modified: 25-06-2019 11:55am AEST