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During the last decade, reduced efficacy and failure to control perennial ryegrass (Lolium perenne L.) with labeled rates of Acetolactate Synthase (ALS) inhibitor herbicide (MSM-IDS) were reported. In this context, the effects of MSM-IDS (Sulfonylurea) on suspected resistant (Mateur) and susceptible (Tinja) ryegrass biotypes, prospected in Tunisian wheat fields, were investigated in comparison with...