Win the Waterhemp Control War: A 3-Step Approach
Waterhemp has become one of the most challenging weeds in soybeans. It emerges throughout the growing season, but is often more prevalent late in the season, beyond the control window of most residual preemergence and contact postemergence herbicides.
Waterhemp evolves to develop herbicide resistance more quickly than other weed species and populations are resistant to one or more of six herbicide classes: Group 2 (ALS inhibitors), Group 4 (2,4-D), Group 5 (triazines), Group 9 (glyphosate), Group 14 (PPO inhibitors) and Group 27 (HPPD inhibitors).
Use a triple-powered approach to control waterhemp:
1. Multiple Effective Modes of Action
2. Full Herbicide Rates
Waterhemp is competitive with soybeans, so early, aggressive control is key to protecting yield. Use full labeled herbicide rates for the best early season control and longest residual activity against waterhemp.
3. Early Control
Control waterhemp before it reaches 4 inches. Scout regularly after crop emergence to time a postemergence herbicide application. Waterhemp plants can grow more than an inch a day, so timely application is critical.
Cultural practices, including narrow rows and optimum plant populations, will help the soybean crop compete with weeds, but most experts recommend avoiding tillage when waterhemp is the primary weed concern, since that can trigger weed germination.
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