Herbicide options are limited for the control of wild carrot in field crops in Ontario. This study, which comprised 25 field trials: 9 in corn [4 preemergence (PRE) and 5 postemergence (POST) herbicide trials], 8 in soybean [3 preplant (PP) and 5 POST herbicide trials], and 8 in winter wheat (8 POST herbicides trials), was completed to determine the most efficacious herbicides for the control of wild carrot in these crops. There was no significant visible injury in corn, soybean, and winter wheat with the herbicides evaluated. Atrazine, dicamba, dicamba/atrazine, isoxaflutole atrazine, mesotrione atrazine, saflufenacil, and saflufenacil/dimethenamid-P applied PRE provided inadequate (39%–75%) control of wild carrot in corn. Prosulfuron dicamba applied POST at 10 140 g a.i. ha-1 controlled wild carrot 93%–97%, with density and biomass similar to the weed-free control in corn. Among the PP herbicides evaluated in soybean, only glyphosate (2700 g a.i. ha-1) and glyphosate imazethapyr (900 100 g a.i. ha-1) controlled wild carrot >80%. None of the POST herbicides evaluated in soybean provided adequate control of wild carrot. In winter wheat, prosulfuron bromoxynil (10 140 g a.i. ha-1) controlled wild carrot 83%–86% compared with other herbicides, which controlled wild carrot 21%–73%.
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Vol. 98 • No. 2