Bentazone is a selective contact (foliar) herbicide for postemergence control of annual broadleaf weeds and yellow nutsedge in a variety of crops including soybeans, alfalfa, beans, corn, peas, peppers, and sorghum.1 It also has activity on some perennial broadleaf weeds such as Canada thistle and field bindweed. Some bentazon products are labeled for use in turf, lawns, and noncrop sites. In 2019, approximately 158,000 pounds of bentazon were sold in Minnesota.

Mode of Action

Bentazone controls weeds by inhibiting photosynthesis by binding to a protein in photosystem II, herbicide site-of-action 6.3 Herbicides in sites-of-action groups and bind to different sites on this same protein.

Issues with Resistance

Herbicide resistance is the inherited ability of a plant, such as weeds, to survive an herbicide application that the original population was susceptible to. The development of resistance is a growing concern for weed management because it can lead to the loss of herbicide options, which can have important economic and environmental consequences. Bentazone resistant weeds have not been reported in the United States. Resistant smooth pigweed (Amaranthus hybridus) and redroot pigweed (Amaranthus retroflexus) have been reported in Ontario, Canada. To prevent the development of resistant weeds, use practices such as rotating and combining herbicide sites-of-action and utilizing mechanical weed control.

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DiazinonBentazone is used as herbicide in wheat field
Bentazone is a selective contact (foliar) herbicide for postemergence control of annual broadleaf weeds and yellow nutsedge in a variety of crops including soybeans, alfalfa, beans, corn, peas, peppers, and sorghum.1 It also has activity on some perennial broadleaf weeds such as Canada thistle and field bindweed. Some bentazon...