Ongoing evaluation key to controlling weeds, improving yield in soybeans

As the sun bears down on record U.S. soybean acres, farmers keep their eyes on their fields to evaluate weed control decisions made earlier in the year. Ongoing scouting and peer discussions near harvest can help your customers fight back against persistent weeds the following season.

Every field potentially has unique weed management challenges depending on weather, soil type and weed control methods, which is why it’s hard to make decisions solely based on other farmers’ experiences. In addition to conversations with farmers, Dow AgroSciences field scientist Dave Ruen recommends consulting with trusted retailers, herbicide and seed suppliers, and Extension weed scientists for additional support.

“At this point in the season, farmers can see weed control performance firsthand in their own fields and ask specific questions to improve their programs for the following season,” Ruen says. “Herbicide-resistant weeds, particularly Palmer amaranth and waterhemp, are top of mind for many Midwest farmers this year.”

Ranked as two of the most troublesome and most common weeds of 2017 by the Weed Science Society of America, waterhemp and Palmer amaranth can cause devastating yield loss if left uncontrolled.

A preemergence first strike against waterhemp and Palmer amaranth can give soybeans the early season boost needed to improve yield potential. The best strategy to control these weeds includes a program approach using preemergence and postemergence herbicides with multiple modes of action.

Sonic® herbicide can be applied in the fall, preplant incorporated, preplant or preemergence up to three days after planting, before soybeans emerge. With two nonglyphosate modes of action, Sonic controls many broadleaf weeds resistant to glyphosate, including waterhemp, Palmer amaranth, giant ragweed and common ragweed.

Another way your customers can battle herbicide-resistant weeds is to stay current on newly identified resistance in their geography and keep detailed notes of specific weed pressure in their fields. Electronic files are easy to customize for individual fields based on crops and known weeds. Plus, they can be used as visual aids to build an inventory or cropping mix, and program solutions for the 2018 season.

Read more about waterhemp, Palmer amaranth and controlling other high-anxiety weeds from Dow AgroSciences field experts at

®™Trademark of The Dow Chemical Company (“Dow”) or an affiliated company of Dow. Sonic is not registered for sale or use in all states. 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. ©2017 Dow AgroSciences LLC