Reflex PSPE 1000ml/ha applied on (from top left) Vetch, Perennial ryegrass, Cocksfoot, Phalaris and Wimmera ARG
Weeds (wild radish and capeweed in bottom right corner)
Vs
Untreated control
English
Roberto Busi
3.7K posts
Roberto Busi
@robbert115
Bob's dad Pasture Weed Scientist @DPIRDbroadacre Adjunct @UWAresearch
Perth, WA Katılım Mart 2009
1.8K Takip Edilen3.7K Takipçiler
Roberto Busi retweetledi
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
English
Roberto Busi retweetledi
Sentry pre 50g against sensitive brome grass (left) vs IMI resistant brome (right)
English
Roberto Busi retweetledi
Doing resistance testing on capeweed some insight on which herbicide can do what (from left):
-0.5 Glyph450 👎
-0.5L Tigrex 👎
-1L Glyph 👍 (bare minimum)
-0.5L Spray.seed 👍👍
-2L glyph 450 👍👍
If you need resistance testing help pls send us a text or call.
English
-Annual systems (photo Jan '26) strong early production
-Perennial, diverse systems deliver the highest total productivity over time.
-Lucerne-based multi-species mixes were the most robust and productive across seasons.
-Resowing annuals did not overcome the performance gap
English
Lucerne + herb systems consistently high-performing
Mix 50 (lucerne+chicory+plantain+grasses - photo Jan '26):
High production in both years
Best cumulative yield
Seeding rate was not a driver of productivity
High-rate mixes (e.g. 70 kg/ha) did not outperform lower-rate mixes
English
Statistical analysis update P365 project: Kg DM/ha for 8 pasture mixes grown at focal site in Manjimup (2024 & 2025)
ANOVA letters on the 2024+2025 DM totals.
Highlights:
-Highest production from annual mixes in 2024
- In 2025 perennial, diverse mixes outperform annuals
Roberto Busi@robbert115
Today it was a great Pasture 365 field day at Manji! Thanks to all those attending, DPIRD Manji crew and Jeisane for organizing it all!
English
Nasty ryegrass resistant to glyphosate + paraquat? Clethodim still got the job done. Want to be sure what you’re dealing with—send samples to UWA for resistance testing.
Herbicide resistance lab at UWA@resistance_test
Last but not least: These two ryegrass populations, highly glyph and paraquat resistant, are both 100% controlled with clethodim240 500ml + 1% Hasten + 1% Outright. We will be doing quick test for whoever needs help. Just send a text…
English
Roberto Busi retweetledi
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.
English
The variability within the trays of each treatment appears related to the level of glyphosate resistance in ARG studied (and the + correlated difficulty of killing ARG with glufosinate).
English
I will speak about all things glufosinate next week at Perth GRU (17 Feb), Lake King regional Updates (25 Feb), then MIG pre-sowing trial review (4 Mar), then Kalannie Updates (10 Mar).
Here glufosinate interaction with increasing level of AMS.
English
@BradW00ldridge I found Kik and orher C4 perennial grasses are highly tolerant to atrazine, simazine and metribuzin. Would that have been an option instead of glyph?
English
After much reading and consultation, we thought 1L powermax in June would be safe on kike. Nope, smoked it 100%, missed spot on right
English
@4FarmersBill @Tedthekelpie Assuming the reduction in yield is real: does it come from greater weed germination or greater crop effect of the pre herbicide or both and is there any rule of thumb on fine tuning / settle over a certain soil wetter rate?
English
@Tedthekelpie Yes Sam, but was the drop significant statistically? No, I don’t believe so. The earlier work I did with wetter on shallow duplex soil (no humectant) saw increasing yield to 50 L/ha. What we can be confident is that most of the benefit comes from the low rates.
English
Huge wheat response to 2 L/ha of #Aquifer. For such a small cost it makes me think this product should go over most crops in sandy WA soils, the humectant component is very valuable too.
English
Something to test again this coming winter. Response of phenotype resistant wild radish against 2,4-DB and a pre-em applied EPE at full rate.
From left
UTC,
3.5L 2,4-DB solo
2,4-DB + Overwatch
2,4-DB + Propyzamide
2,4-DB + Ultro
Last one killed radish 100%.
English
Today it was a great Pasture 365 field day at Manji! Thanks to all those attending, DPIRD Manji crew and Jeisane for organizing it all!
English
@rogstates 1080 vs 420. small weeds 2 leaf.
There is quite a bit of evidence of this correlation
chatgpt.com/s/t_695e1e3756…
English
Glyphosate resistance well correlates with greater survival to glufosinate (ie poorer control). Here an example of 3ARG populations with nil, mid and high resistance to glyphosate vs the same sprayed with glufosinate.
Work to do to understand why but it is very clear & neat.
English
Next generation systemic PPO herbicide (fendioxypyracil) developed by BASF. It does have grass activity and it should be really good against ARG.
biorxiv.org/content/10.648…
English
@AaronHutcho Need to do more work to exactly understand how to bypass low activity of glufosinate - I’ve done work on adjuvants, mixing partners and patterns - much known already. This + correlation between glyph and glufo survival in ARG should be studied at biochemical depth.
English
@robbert115 Could it be a barrier for translocation due to both being salt based carriers. Very interesting Roberto but disappointing also. Makes you wonder with sometimes lower water rates and high concentrated drops of gly particularly in winter with high humidity work better, salt trans.
English