@robbert115

Bob's dad Pasture Weed Scientist @DPIRDbroadacre Adjunct @UWAresearch

 Perth, WA
busiproject.weebly.com
Joined March 2009
  • Tweets3.9K
  • Following1.8K
  • Followers3.8K
1.4KMedia
Mi mancherete tantissimo non posso sopportare questo divorzio
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Roberto Busi retweeted
WeedSmart@WeedSmartAUOct 6
From 150 annual ryegrass samples, @robbert115 found no resistance to a tank mix of trifluralin and pyroxasulfone. Help keep herbicide resistance at bay by using as many weed control tactics as possible! buff.ly/yq41CSD💧🚜🌾
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Roberto Busi retweeted
4Farmers
@4Farmers_Sep 28
Field walk tomorrow in Quairading! Get along and hear @robbert115 @4FarmersBill and David Seagreen.
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Clethodim resistance (@500ml) - left - does NOT cross to Factor (@180g) - right - Important to test for both standalone options to know what ryegrass you’re dealing with.
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A robust paraquat rate (2nd knock) did control the ARG 100% (mildly resistant to Glyph and Cletho). 1.5L/ha Paraquat250 is generally a robust rate under controlled conditions. The new low paraquat rate will create a lot of noise, even from a resistance testing perspective!
Herbicide resistance lab at UWA@resistance_testJul 21
This what seen in a WA sample under testing. Plants surviving 1L Paraquat 250 or 1.5L Boonta will be double knocked with robust rate of Paraquat to confirm if we have another case of dual resistance to glyphosate and Paraquat. Big plants from fenceline vs small from paddock.
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Roberto Busi retweeted
Roberto Busi@robbert115Aug 8
Interesting to observe the undisputed great weed control of wild radish and capeweed! Some pastures appear particularly tolerant: Tetraploid ryegrass (Vortex), subclover (Forbes), Berseem & Crimson clovers and Yellow Serradella (SerraMax). Awesome haircut result IMO. What else ?
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Roberto Busi retweeted
Roberto Busi@robbert115Jul 23
if you have come 'till here, then should we organize a field walk to maybe also see a 20 treatment capeweed herbicide trial and newly established plots next door?
100%Yes
0%Don't bother :-)
21 votes • Final results
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Three photos to show a stark contrast in annual ryegrass resistance (2026): - >20% of tested populations showed glyphosate resistance - <1% paraquat resistance - 0% resistance for glufosinate + paraquat mix. Testing remains critical to preserve herbicide options.
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2026 test for clethodim240 (500ml/ha+Hasten+ AMS), butroxydim250 (180g/ha+Hasten+AMS) or their tank mix resistance - 150 paddocks % of samples with > 20% survival: - Clethodim 16% - Butroxydim 10% - Clethodim+Butroxydim 3% Resistance frequency very consistent w/ previous years
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Roberto Busi retweeted
Nick Eyres@eyres_NJun 25
N dynamics with sowing densities and N inputs in a high N environment - to better understand legacy NUE. This time in a clay loam soil type and compare with the deep ameliorated sand in Yuna. Looking the part with big differences in early light interception. @GRDCWest
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Close up to the one population that is resistant to solos Trif or Sakura but NOT RESISTANT to the tank mix of Sakura Trif
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One photo summary of wild oats resistance testing 2026 (% samples >20% survival): -50% samples with FOP resistance, -20% with DEN resistance, -10% with DIM resistance (42g ai) -0% with DIM resistance at full rate (120g ai).
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Very good turnout this morning inspecting the results of recent resistance testing work in ryegrass, wild radish and wild oats. Send me a text if in Perth and want to inspect the pots - discuss results.
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Synergistic herbicide mixtures vs 36 samples of wild radish collected at harvest 2025.
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Replying to @farmersgrowit @hirschirsch
This is what I have observed on paraquat-resistant ARG (18DAT). Hasten with Gramx and AMS with glufosinate. It's just a start, not yet an (scientific) answer but worthwhile a bit more work.
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Roberto Busi retweeted
Matt Witney@DMAg_consultantMay 25
AMS showing its benefits to assist glyphosate in controlling self sown cereals and other grasses. Here it’s been tank mixed with triazines, with and without AMS and control is chalk and cheese. AMS assisting with Antagonism with group 5 pre ems @CropDoctor54 @robbert115
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Wild radish appears better controlled by either glufosinate or glyphosate applied as stand-alone. Mild antagonism observed with the tank mix.
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We recently tested these WA ryegrass seedlings suspected of glyphosate resistance (photo of the paddock and transplanted ARG). We tested full rates of: - glyphosate - clethodim - glyph + clethodim - glyph + glufosinate
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If you need to test in what silo your Tomahawk seed has been stored we can help with rapid turnaround times. Here seed sprayed PRE with Sentry will emerge and show symptoms in 7-10 days.
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Broadacre farm profit heat map from @ABARES most recent update
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