July 2, 2021
Early flowering radish and HWSC
I was on a trip a couple of years ago with Ray Harrington talking all things harvest weed seed control (HWSC) to groups of…
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AHRI Insight
AHRI Insight
June 2, 2021
Don’t poke the bear with Dims and Dens in cereals
Written by: Peter Newman Last week we had a great question from Western Australian agronomist, Tim Boyes who was wondering whether he should spray cereal…
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AHRI Insight
April 13, 2021
A new glyphosate resistance mechanism with similarities to cancer drug resistance
AHRI researchers have identified a new glyphosate resistance mechanism which has similarities to cancer drug resistance in humans.
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AHRI Insight
March 31, 2021
2,4-D synergises metribuzin
Synergy between herbicides is rare, but extremely sort after and this synergy is often claimed but it takes a specific research technique to confirm the synergy. Australian farmers and agronomists have previously observed synergy between phenoxy herbicides (2,4-D) and PSII herbicides (Group C / Group 3 herbicides such as metribuzin) and now we know why, thanks to this new AHRI research.
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AHRI Insight
February 15, 2021
World first: glyphosate resistant capeweed
We’re blowing up our most valuable herbicides on the least productive part of the farm.
Fencelines, roadsides, drainage areas, etc.
AHRI researchers, Dr Yaseen Khalil and Dr Mike Ashworth and others have confirmed the world’s most recent addition to the growing list of glyphosate resistant weeds: capeweed.
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AHRI Insight
February 1, 2021
We’ve cracked the P450 code
About 35 years ago a ryegrass population that had been sprayed several times with Hoegrass® (Diclofop) became resistant to that herbicide and cross resistant to Glean (chlorsulfuron) before Glean® or any other ALS herbicide had ever been used in Australia.
P450 enzymes were suspected to be the cause of this cross resistance but it has taken until now to get the definitive evidence.
A very patient group of researchers led by Heping Han from AHRI, including researchers from Bayer and Zheijiang University in China have identified the P450 gene responsible for cross resistance to herbicides of at least five modes of action.
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AHRI Insight
December 1, 2020
The herbicide mixture is greater than the sum of herbicides in the mix
AHRI researcher, Dr Roberto Busi is no philosopher, but he has recently published some significant research that shows that Aristotle knew a thing or two about herbicide resistance despite being born over 2000 years before the first herbicide. Amazing! The message from this research – never assume that a herbicide mixture will fail even if there is resistance to both components of the mix.
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AHRI Insight
November 3, 2020
2,4-D antagonises glyphosate, especially in glyphosate resistant weeds
Some recent research by a former AHRI researcher Jingbo Li and others shows that glyphosate resistance changes this. They studied two populations of barnyard grass with relatively low-level glyphosate resistance and found that when 2,4-D Amine or Ester was added to the tank with glyphosate, barnyard grass control was greatly reduced. They went on to discover that this is due to an effect on uptake and translocation.
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AHRI Insight
September 7, 2020
Reversing trifluralin resistance
They said it couldn’t be done – climbing Everest, flying to the moon and even deep-frying Mars bars. We were also told that we couldn’t reverse herbicide resistance. In the majority of cases, the experts are right – herbicide resistance is permanent, and we thought that was the case for all resistant weeds.
Until now…
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AHRI Insight
August 4, 2020
Metribuzin resistant ryegrass via metabolism
This AHRI insight is not for the faint-hearted. This recent AHRI research by Chinese postdoc Hongju Ma and others documents the first case of metabolic resistance to metribuzin in ryegrass in Australia. The ryegrass in this population was only about 3 fold resistant to Atrazine and Metribuzin. The researchers used a P450 inhibitor, PBO, and radiolabelled metribuzin to help determine that the resistance is metabolism-based, likely due to P450 enzyme activity.
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AHRI Insight
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