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Australian Herbicide Resistance Initiative (AHRI)

Blog: AHRI insight

Australian Herbicide Resistance Initiative (AHRI)

Early flowering radish and HWSC

Some recent AHRI research by Chinese research student Ci Sun, and Dr Mike Ashworth and others has investigated some early flowering wild radish and found that it does indeed set its seed below the harvest height. But we can ‘adapt and overcome’ to this new genetic trait by increasing crop competition.

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Australian Herbicide Resistance Initiative (AHRI)

Don’t poke the bear with Dims and Dens in cereals

Last week we had a great question from Western Australian agronomist, Tim Boyes who was wondering whether he should spray cereal crops with Pinoxaden (Axial®) and get 50% control or save this chemistry for the break crops (he had a resistance test result). We went to the research and found a paper from 2007 by AHRI researcher, Dr Qin Yu and others for the answer. Read more!

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Australian Herbicide Resistance Initiative (AHRI)

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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Australian Herbicide Resistance Initiative (AHRI)

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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Australian Herbicide Resistance Initiative (AHRI)

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…

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Australian Herbicide Resistance Initiative (AHRI)

AHRI 2020 Wrap Up

Despite the challenges 2020 presented, there continued to be excellent research which was published throughout the year. In this post we have collated our top five most read AHRI insights and our top five most listened to podcasts for 2020.

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Australian Herbicide Resistance Initiative (AHRI)

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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Australian Herbicide Resistance Initiative (AHRI)

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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Australian Herbicide Resistance Initiative (AHRI)

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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