Act quickly to control waterhemp

Ridding cornfields of the yield-limiting weed waterhemp requires an early action plan.

A slender plant with multiple branches and long, narrow leaves, waterhemp’s height can range from 4 inches to 12 feet. It is identifiable by its smooth, hairless and glossy leaves that vary in color from a bright red or pink to emerald green. An annual weed, waterhemp is a member of the pigweed family. As such, it is a prolific seed producer, yielding at least 250,000 seeds per plant.

Identifying waterhemp correctly can be difficult because it looks similar to Palmer amaranth and other pigweed species in early growth stages. Waterhemp’s first true leaves are generally longer and more lance-shaped than other pigweeds.1


The crop-competitive weed has developed documented resistance to six classes of herbicides in the past 23 years, including triazines, ALS inhibitors, PPO inhibitors, glyphosate, 2,4-D and HPPD inhibitors.

Aggressive tillage and a program approach using preemergence herbicides followed by postemergence herbicides with multiple modes of action is the best strategy to control waterhemp. Resicore herbicide offers a novel formulation of three leading active ingredients and three modes of action for residual control of waterhemp, even those resistant to glyphosate, atrazine or ALS herbicides.

For more information about controlling waterhemp and many other weeds that can consume your customers’ cornfields, visit

1Nordby, D., B. Hartzler, and K. Bradley. 2007. Biology and Management of Waterhemp.

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