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Australian Herbicide Resistance Initiative (AHRI)

AHRI insight

Australian Herbicide Resistance Initiative (AHRI)

Ryegrass resists Sakura® the same way wheat does

The Sakura rugby team were formidable. They would turn up to play every game at the Ryegrass Cricket Ground (RCG – also known as the G) and win every game for ten years in a row. They were better in the wet than the dry, but regardless of conditions they were never beaten. Having no opposition every game perhaps had something to do with it! Then one day they turned up for their usual game, feeling relaxed, until they realised they had an opposition, the GSTs. The GSTs were huge (think a team of Jonah Lomu’s) and there were about…

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Australian Herbicide Resistance Initiative (AHRI)

Mixtures rock! Next level resistance testing tells a big story

Alright stop, collaborate and listen. Busi’s back with a brand new invention. Something grabbed a hold of him tightly, testing resistance daily and nightly. Will he ever stop? I don’t know! Turn off the lights and he’ll glow. Testing was a problem, Busi has solved it. Check AHRI insight while my DJ revolves it.

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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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