As your customers evaluate this season’s yield and adjust their weed control plans for next season, reinforce the value of a preemergence herbicide with them for a clean start. If they rely only on postemergence applications, waterhemp, marestail and other common weeds can start robbing corn and soybean yield right after planting.
Spring is a vulnerable time for crops as they require a strong start to thrive for the rest of the season. In an April poll by Corteva Agriscience, most retailers — 58 percent — selected waterhemp as their customers’ most challenging weed followed by marestail at 23 percent.
Marestail is generally considered the most difficult weed to control if it can overwinter into the spring. When this happens, marestail grows rapidly as temperatures warm, robbing soil of two critical inputs: moisture and nitrogen. Since marestail can germinate throughout the entire year, it’s important for retailers and farmers to scout for it year-round and identify it early in the rosette stage for effective control.
The photos below were taken in McLean, Nebraska, on July 9, 2018. McLean is in the Northeast part of the state and where marestail is one of the biggest weed challenges. The fields shown received spring applications of Sonic® herbicide in soybeans and Resicore® herbicide in corn to allow the crops to grow with less weed competition.
To reduce the spread of resistant weed populations, such as marestail and waterhemp, farmers should plan their herbicide control and crop rotation for more than a single year at a time. The most important tip for farmers fighting these weeds in their corn or soybean fields is to act early by starting with a preemergence herbicide to keep weeds small and easier to control.
Resicore® herbicide gave this Nebraska cornfield a powerful start against yield-robbing weeds, such as marestail and waterhemp.[/caption]
Sonic® and Resicore® are not registered for sale or use in all states. Resicore is not available for sale, distribution or use in Nassau and Suffolk counties in the state of New York. Contact your state pesticide regulatory agency to determine if a product is registered for sale or use in your state. Always read and follow label directions.