Waterhemp is a troublesome agronomic weed of the midwestern United States that has demonstrated a propensity to evolve herbicide resistance. Herbicides or herbicide groups to which resistance has been documented in waterhemp are triazines, acetolactate synthase (ALS) inhibitors, protoporphyrinogen oxidase (PPO) inhibitors, and glyphosate. Waterhemp's obligate outcrossing (owing to its dioecism) results in accumulation of multiple resistance traits within single populations, and even within single plants. The presence of such multiple-resistant waterhemp populations leaves crop producers with few effective herbicide options, particularly for postemergence control in soybean. In fact, the recent history of postemergence herbicides in soybean shows a recurring scenario, in which waterhemp evolves resistance to the primarily used herbicide or herbicide group (first ALS inhibitors, then PPO inhibitors, now glyphosate). In all likelihood, this history will continue to repeat. Thus, whether obtained by conventional or biotechnological means, new herbicide options will be needed to manage waterhemp.

Herbicide resistances in waterhemp (<i>Amaranthus </i><i>tuberculatus</i>): A call for new options

239th National Meeting (2010)

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Herbicide resistances in waterhemp (Amaranthus tuberculatus): A call for new options