January 1, 2025Weed Science

Detection of herbicide resistance and a novel ALS-inhibitor mutation in Alabama Italian ryegrass (Lolium perenne ssp. multiflorum) populations

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Field surveys reveal herbicide resistance and ALS-inhibitor mutation in Italian ryegrass, indicating urgent agronomic implications.

Resistance to glyphosate was confirmed at a level 192-fold higher than susceptible strains.
Out of 44 evaluated populations, 21% showed glyphosate resistance, while others exhibited resistance to different herbicides.
Greenhouse assessments compared sensitivity across multiple herbicides, including ALS and ACCase inhibitors.
Findings highlight specific mutations contributing to herbicide resistance, necessitating new management strategies.

Yadav et al. (2025) studied this question.

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