Abstract
Herbicide efficacy was examined in the greenhouse on bigroot morningglory seedlings and on established plants in the field. Dicamba (0.14 kg ae ha-1) and 2,4-D (0.28 kg ae ha-1) alone or combined, glyphosate (2.24 kg ai ha-1), fluroxypyr (0.28 kg ae ha-1), and triclopyr (0.42 kg ae ha-1) controlled more than 90% of bigroot morningglory seedlings. Fluroxypyr (0.56 kg ha-1), triclopyr (0.84 kg ha-1), and 2,4-D (0.56 kg ha-1) alone or combined with dicamba (0.28 kg ha-1) reduced established stands in the field at least 50% within the season of application, whereas clopyralid (0.56 kg ha-1) did not provide acceptable control. Glyphosate (2.24 kg ha-1) was among the best treatments for long term control at all locations.
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