Australian Herbicide Resistance Initiative (AHRI)



AHRI Snapshots is a podcast which provides info on what we do at AHRI

Our researchers work out of the University of Western Australia, next to the beautiful Swan River in WA’s capital, Perth.

If you’d like to listen and subscribe to our podcast via iTunes, click here. You can also subscribe via SoundCloud here

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What’s the relationship between crop competition and harvest weed seed control?

In this edition of AHRI Snapshots, we’re speaking with Director of Weed Research at the Plant Breeding Institute, University of Sydney, Michael Walsh about a recent research paper on crop competition and its influence on harvest weed seed control on ryegrass. We know crop competition is great at suppressing weeds, but what we have learned from this research is that crop competition makes other weed control techniques, such as harvest weed seed control work better. Take a listen to learn more!


Tridax daisy resistance explained

Heping Han

In this podcast, AHRI researcher Dr Heping Han talks about the results of the paper “Glyphosate resistance in Tridax procumbens via a novel EPSPS Thr-102-Ser substitution”. This is the first report of glyphosate resistance in Tridax. The mechanism of glyphosate resistance was studied.  Various possible resistance mechanisms were NOT responsible for resistance (EPSPS gene amplification, different glyphosate uptake or translocation). In the glyphosate-resistant Tridax population studied, the glyphosate resistance mechanism is a mutation in the EPSPS gene causing substitution at amino acid 102 (Thr-102-Ser). This is the first time that a single amino acid substitution at Thr 102 has been reported to endow…


Trifluralin resistance mechanisms – what we know so far

Jinyi Chen is an AHRI PhD Candidate studying trifluralin resistance mechanisms in annual ryegrass. Annual ryegrass is a very serious crop weed in Australia causing significant yield loss. The pre-emergence herbicide trifluralin has been used since the 1970s in Australia to control ryegrass. The first trifluralin resistant annual ryegrass plant was reported in 1995. Recently, increasing trifluralin resistant ryegrass populations were reported in Western Australia and South Australia. In her research, Jinyi has found that all the four annual ryegrass populations or biotypes tested contained metabolic resistance mechanisms, with target site resistance being involved in two of them.


Michael Widderick talks the Australasian Weeds Conference and crop competition research

In this podcast, we’re getting an insight into the 21st Australasian Weeds Conference, which this year was held in Manly. The AWC is a biennial conference and carries on a long tradition of bringing the weed management community together to discuss new developments and share information about cutting-edge and best weed management practices. AHRI Communications Lead, Jessica Strauss, was lucky enough to attend and caught up with Dr Michael Widderick, Principal Research Scientist at the Queensland Department of Agriculture and Fisheries. He presented at the conference on “Research priorities for weed suppression by crops in Australia”.


AHRI agronomy research update and how the new lab is operating

In this podcast, we catch up with AHRI Research Officer Roberto Lujan Rocha. This is the first time Roberto has been on the podcast. We learn about what the AHRI agronomy team, led by Mike Ashworth, is up to with their research trials and get a better understanding of how the new GRDC Agronomy Lab is operating since its June opening.


The results are in! Chaff lining suppresses weed emergence – John Broster explains

Chaff lining has been increasing in popularity in the Harvest Weed Seed Control (HWSC) scene over the past two seasons. A survey of WeedSmart subscribers showed the percentage of growers using chaff lining increased from 6% in 2016 to 26% in 2017. Despite this rapid uptake of chaff lining, there really was no data available specific to its efficacy! However, there’s now compelling research data coming through for chaff lining and it seems you get really good value for money and it does suppress weed emergence. Take a listen to learn more!