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Australian Herbicide Resistance Initiative (AHRI)

World first: glyphosate resistant capeweed

Tag Archives | mechanisms

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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Australian Herbicide Resistance Initiative (AHRI)

On a good thing? Don’t stick to it! – the Director’s Cut

Welcome to the highlight reel of AHRI’s recently released blockbuster – ‘Don’t stick to it!’. Set in the labs, glasshouses and fields of this world-leading research powerhouse, and featuring renown giants of the herbicide resistance world – Powles, Busi, Yu and Owen, this latest exposé will have you seriously impressed! ‘Don’t stick to it!’ delves into five years of ground-breaking scientific discovery and its value to Australian farmers in their epic battle against profit-sucking weeds.

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Australian Herbicide Resistance Initiative (AHRI)

Diflufenican resistance in wild radish is by P450s

In 1999 I was refuelling my car at a petrol station in Geraldton when I bumped into Dave, a technician with the local Department of Ag. Dave told me he had just returned from a trial where wild radish had survived 600 mL/ha of diflufenican (e.g. Brodal®). This was three times the maximum label rate and six times the common use rate at the time. I could see the entire lupin industry unravelling in front of my eyes. Lupins were a huge success story on our sandplain soils in the area, wild radish was their main Achilles heel…

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Australian Herbicide Resistance Initiative (AHRI)

The reality of spontaneous mutation

Not surprisingly, de novo mutations are quite rare in the real world – but even rare things can happen if the population is large enough. When it comes to the evolution of herbicide resistance, there are two biological pathways. The first is simply natural selection where a small number of the population can withstand a particular stress (e.g. herbicide), they set seed and eventually their progeny are the majority, and they generally thrive. Resistant alleles may prolificate at the site of selection (i.e. due to frequent and regular use of a particular herbicide at that site) or they might be…

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Australian Herbicide Resistance Initiative (AHRI)

Luximax gets its own NEW box

We all put things in boxes inside our head to help us organise our brain. A few of the important boxes I have inside my head – fishing spots, great moments in sport, top five meals of all time, jokes, song lyrics, useless trivia, movie quotes, WA town license plates, and of course the nothing box (the place every man retreats to when he has five minutes of peace and quiet!). Ok, it’s not an over-achieving brain but it gets me by. However, sometimes something new will come along and it won’t fit into your existing boxes. It might need…

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