Fight back against glyphosate-resistant weeds

Soybean farmers are no strangers to resistant weeds as 15 states in the United States have reported glyphosate-resistant weeds in the past 20 years.1 One of the best ways to help your customers get a handle on glyphosate-resistant weeds is to start with a clean field in the spring. In many cases, this means using tillage to have a clean seedbed and/or using a burndown herbicide before coming back with a soil-applied, residual herbicide.

“The only way to really claim back this territory from resistant weeds is to have a weed-free field going into harvest,” says Dave Ruen, field scientist, Dow AgroSciences.

Ruen adds that it is important to use proper herbicide rates. In many cases, this will be near or at the full use rate on the label. After applying a preemergence herbicide, scout fields for surviving weeds so you can select a proper postemergence herbicide with multiple modes of action that will be effective against glyphosate-resistant weeds.

As farmers contend with 16 glyphosate-resistant weed species,2 it’s important to recommend preemergence, residual herbicides with multiple modes of action to manage future resistance. Sonic® herbicide provides two nonglyphosate modes of action to control your customers’ worst broadleaf weeds.

To learn more about how your customers can battle herbicide-resistant weeds this spring, visit

Palmer amaranth

Palmer amaranth continues to spread from the South to the upper Midwest, making it critical for soybean farmers to use preemergence, residual herbicides to control this glyphosate-resistant weed early.

1Heap, I. 2017. The International Survey of Herbicide Resistant Weeds.
2Take action on weeds. 2017. How weeds become resistant.

®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