WEED OF THE MONTH: Marestail

Trends:

  • According to WeedScience.org, 24 states have confirmed glyphosate-resistant marestail. The most recent glyphosate-resistant marestail was reported in 2013 in Alabama and Wisconsin.
  • The germination window has expanded and now includes summer.5

Resistance statistics:

According to WeedScience.org:

    • Herbicide classes
    • Multiple resistance confirmed in:
      • MI:
        • Photosystem II inhibitors, PSII inhibitor (chlorotoluron)
      • OH:
        • ALS inhibitors, glyphosate
      • MS:
        • PSI electron diverter, glyphosate
      • DE:
        • ALS inhibitors, glyphosate

Marestail management tips:

Joe Armstrong, field scientist, Dow AgroSciences says:

  • Apply a residual herbicide to control marestail. Follow up with a fall application to keep fields clean going into winter.
  • A preemergence herbicide will open a wider window to apply a postemergence herbicide to control any remaining marestail.
  • Scout for marestail year-round and learn to identify it in the small rosette stage.

Dow AgroSciences weed control solutions:

Corn
SureStart® II herbicide
Keystone® NXT herbicide
Keystone® LA NXT herbicide
FulTime® NXT herbicide
Surpass® NXT herbicide
Durango® DMA® herbicide
Duramax® herbicide
Enlist™ Weed Control System

Soybean

Sonic® herbicide
Surveil™ Co-pack herbicide
Durango® DMA® herbicide
Duramax® herbicide

Enlist™ Weed Control System

Additional Information:

More information can be found through this weed science resource:

1Everman W., C. Sprague, S. Grower, and R. Richardson. 2010. An IPM Pocket Guide for Weed Identification in Field Crops.
2PLANTS Profile. United States Department of Agriculture Natural Resources and Conservation Service website. http://plants.usda.gov
3MSU Weed Science website. http://www.msuweeds.com/worst-weeds/marestail/
4Understanding and Managing Marestail. http://www.agprofessional.com/resource-centers/corn/news/understanding_and_managing_marestail_120009894.html
5University of Illinois Extension. Controlling Marestail (Horseweed) After Crop Emergence. http://web.extension.illinois.edu/state/newsdetail.cfm?NewsID=29274

®Trademark of The Dow Chemical Company (“Dow”) or an affiliated company of Dow. FulTime NXT, Keystone LA NXT and Keystone NXT are federally Restricted Use Pesticides. Duramax, Durango DMA, FulTime NXT, Keystone LA NXT, Keystone NXT, Instinct II, Sonic, SureStart II, Surpass NXT and Surveil Co-pack are 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. 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. Regulatory approvals are pending for Enlist cotton. Always read and follow label directions. ©2014 Dow AgroSciences LLC