Australian Herbicide Resistance Initiative
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AHRI Agronomy Trials

Introducing our new GRDC funded crop competition projects. Dr Mike Ashworth and Roberto Lujan Rocha are working to minimise ryegrass and wild radish weed seed production, whilst maximising yields.

Blog: AHRI insight
The significant weed science research stories of 2018

Mon, 3 Dec 2018

Written by: Jessica Strauss, Peter Newman, Cindy Benjamin, Kirrily Condon  It’s been a big year for AHRI. Former AHRI Director, Stephen Powles retired from the position earlier in the year, with Professor Hugh Beckie from Canada taking on the role.  We also saw the opening of the GRDC-funded Agronomy Laboratory at the University of Western Australia. Research is at the core of what we do though and we didn’t do that in halves this year either! Not only did AHRI produce significant papers, but other weed science groups nationally also made important discoveries. Harvest Weed Seed Control continues to see gains in uptake,…

Featured Publication
Publications Influence of Crop Competition and Harvest Weed Seed Control on Rigid Ryegrass (Lolium rigidum) Seed Retention Height in Wheat Crop Canopies

Tue, 9 Oct 2018

In this paper, Walsh et al at several sites confirmed that the majority of retained Lolium seed at grain harvest will be captured. This was true in crop fields in which HWSC had been conducted for several years. 

Please note that we are NOT stating that plants cannot evolve resistance to HWSC. Indeed, everything that herbicide resistance has taught us is that plant populations will respond to any persistent, effective selection pressure. Importantly, this study showed that a good, competitive wheat crop meant that Lolium responded with taller plants, meaning that retained weed seed was relatively high in the canopy and thus captured by HWSC.  This shows the yield and weed control advantages of having a good, competitive high yielding crop. A healthy, competitive crop, HWSC and diversity in methods of weed control are key to sustainable systems!

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