ArticlePest management science2026
A Trp574-Leu substitution confers resistance to three classes of acetolactate synthase inhibitors in Australian brome grass (Bromus diandrus).
Article in Pest management science, 2026. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Not yet cited in PubMed.
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Abstract
backgroundBrome grass (Bromus diandrus) is a prevalent weed in southern Australian cropping regions which causes significant economic damage in crops and pastures. Before harvest 2023, two populations (named 6-24 and 7-24) suspected of resistance to imidazolinone herbicides were collected from separate fields. Preliminary screening indicated that these populations were resistant to several different acetolactate synthase (ALS)-inhibiting herbicides. Therefore, further characterisation of the level and mechanism of resistance was carried out.
resultsThere was high survival of the resistant populations at the maximum tested rates of sulfometuron (600 g ha
conclusionsThis is the first study reporting a Trp574-Leu mutation as the basis for cross-resistance to ALS-inhibiting herbicides (sulfonylureas, imidazolinones and triazolopyrimidines) in Australian populations of B. diandrus. Control of these populations will require strategic use of pre-emergence herbicides and herbicide-tolerant crops in combination with harvest weed seed control. © 2026 The Author(s). Pest Management Science published by John Wiley & Sons Ltd on behalf of Society of Chemical Industry.
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