Post Emergence Control of Ambrosia artemisiifolia and Associated Weeds on Wheat Stubble Using Selected Herbicidal Active Substances
Keywords:
Ambrosia artemisiifolia, halauxifen-methyl, herbicide mixtures, wheat stubble, weed controlAbstract
Ambrosia artemisiifolia L. is one of the most problematic invasive weed species in Europe due to its high competitiveness, prolific seed production, and negative effects on both agriculture and public health. Its control is particularly important on wheat stubble, where surviving plants may replenish the soil seed bank and increase infestation pressure in subsequent crops. This study evaluated the post-emergence efficacy of selected herbicidal active substances, with particular emphasis on halauxifen-methyl applied alone and in mixtures, against A. artemisiifolia and associated broadleaf weeds under field conditions in western Romania. Seven herbicide treatments and an untreated control were tested, and weed control was visually assessed at 21 and 42 days after application. Halauxifen-methyl applied alone showed moderate efficacy, with mean control values of 67.5% and 72.9%, whereas mixtures performed better, particularly fluroxypyr-meptyl + halauxifen-methyl + triclopyr-butoxyethyl, with 89.2% and 95.8%, and clopyralid + halauxifen-methyl, with 85.4% and 88.8%. Glyphosate-isopropylammonium provided the highest efficacy, reaching 97.5% and 100%. These findings indicate that halauxifen-methyl is more effective in mixtures than alone and support the use of herbicide combinations for more reliable and sustainable ragweed management on wheat stubble.
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