Manage Marestail, Winter Annual Weeds with Fall-Applied Herbicides

Marestail is at the top of the list of high-anxiety winter annual weeds that can create problems for soybean crops when it comes time to plant.

Glyphosate-resistant marestail was discovered in the early 2000s and has spread rapidly across fields in the Midwest, says Joe Armstrong, field scientist, Dow AgroSciences. If left unmanaged, marestail can take away vital nutrients and moisture the soybean crop needs during its initial growth stages. Purple deadnettle, henbit and chickweed also are common winter annual weeds.

“You want to control those weeds prior to planting,” Armstrong says. “That way, you aren’t dealing with them at the time of planting and they aren’t interfering with the planter or robbing nutrients from the young crop. They will also be easier to control when they are small.”

SonicFall applications allow for more herbicide options for effective weed management, Armstrong says. There are a few different strategies to control winter annual weeds in the fall. A fall burndown using Durango® DMA® herbicide can control weeds that have emerged or add a residual herbicide, such as Sonic® herbicide or Surveil™ Co-pack soybean herbicide, to a fall weed management program for increased control in the winter and into early spring to mitigate early season competition, Armstrong says.

“Fall burndown or fall residuals, and then spring burndown and a spring residual, can be very valuable,” Armstrong says.

Sonic and Surveil Co-pack offer long-lasting and broad-spectrum weed control so soybeans can get a clean start.

For information on an effective fall herbicide program, visit

®™DOW Diamond, Colex-D, DMA, Duramax, Durango, Enlist, Enlist Duo, Enlist E3, FulTime, Instinct, Keystone, N-Serve, Sonic, SureStart, Surpass and Surveil are trademarks of The Dow Chemical Company (“Dow”) or an affiliated company of Dow. ®Roundup Ready is a registered trademark of Monsanto Technology LLC. Always follow IRM, grain marketing and all other stewardship practices and pesticide label directions. Roundup Ready® crops contain genes that confer tolerance to glyphosate herbicides. Glyphosate herbicides will kill crops that are not tolerant to glyphosate. B.t. products may not yet be registered in all states. Check with your seed representative for the registration status in your state. FulTime NXT, Keystone LA NXT and Keystone NXT are federally Restricted Use Pesticides. Duramax, Durango DMA, FulTime NXT, Instinct II, Keystone LA NXT, Keystone NXT, Sonic, SureStart II, Surpass NXT and Surveil Co-pack are not registered for sale or use in all states. FulTime NXT, Keystone LA NXT, Keystone NXT, SureStart II and Surpass NXT are 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. Do not fall-apply anhydrous ammonia south of Highway 16 in the state of Illinois. Enlist E3 soybeans are being jointly developed by MS Technologies and Dow AgroSciences. Regulatory approvals are pending for the Enlist herbicide solution and crops containing Enlist herbicide tolerance traits. The information presented here is not an offer for sale. Always read and follow label directions. ©2014 Dow AgroSciences LLC