Australian Herbicide Resistance Initiative
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Linkage Project Awarded to UWA

Congratulations to AHRI’s Dr Stephen Powles, Dr Qin Yu and Dr Heping Han on securing ARC Linkage funding in conjunction with Nufarm. The project Elucidating trifluralin resistance in Australian major weed Lolium rigidum has received:

$358,107 – ARC; $125,075 cash and $245,844 in-kind from the partner organisation Nufarm Australia

This project seeks to identify the biochemical and molecular basis of trifluralin resistance in Lolium populations. Trifluralin is a pre-emergent herbicide used to control crop-infesting weeds and makes a major contribution to Australian grain production through enabling soil-conserving minimum/zero tillage cropping systems.

However, the evolution of resistance to trifluralin in the dominant weed Lolium rigidum now looms, threatening trifluralin sustainability. Fundamental understanding and insights of trifluralin resistance and evolution will assist resistance management, trifluralin sustainability and soil conservation. This will provide significant benefit for Australian grain production.


Blog: AHRI insight
Has herbicide resistance in ryegrass in WA plateaued?

Fri, 2 Mar 2018

“The nice part about being a pessimist is that you are constantly being either proven right or pleasantly surprised.” George Will, American journalist, author and Pulitzer Prize-winner. We are not pessimists at AHRI, but let’s face it, we rarely have good news when it comes to reporting on the level of resistance progression on Australian farms.  We are normally proven right that herbicide resistance levels are continually increasing. The latest results from the AHRI random ryegrass resistance survey of WA led by Dr Mechelle Owen isn’t necessarily good news, but it’s about as good as we could have hoped.  We…

Featured Publication
Publications Weed resistance to synthetic auxin herbicides

Thu, 22 Feb 2018

Herbicides classified as synthetic auxins have been most commonly used to control broadleaf weeds in a variety of crops and in non-cropland areas since the first synthetic auxin herbicide (SAH), 2,4-D, was introduced to the market in the mid-1940s.

The incidence of weed species resistant to SAHs is relatively low considering their long-term global application with 30 broadleaf, five grass, and one grass-like weed species confirmed resistant to date.

An understanding of the context and mechanisms of SAH resistance evolution can inform management practices to sustain the longevity and utility of this important class of herbicides.

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