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.
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
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
Trial source data and summary not available Check the trial report PDF for trial results.
Derived climate information
No observed climate data available for this trial. Derived climate data is determined from trial site location and national weather sources.
Site 5, Tenindewa WA
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
2010 trial report
Related Final Reports By Crop type and Region
None No crop specifiedWestern
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Related Final Reports By Author(s)
Grant Thompson, Crop Circle Consulting
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Trial last modified: 25-06-2019 11:56am AEST
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