WEED OF THE MONTH: Cocklebur

Fast facts:

  • The stem below the cotyledons is purple at the base and green in the upper portion. The first true leaves are opposite, while all subsequent leaves are alternate. The large, linear, oblong waxy cotyledons distinguish this weed in the early stages of development.3
  • The flower heads of common cocklebur are unisexual. Small male and female flowers form separate clusters.2
  • The distinct seed pods, or burs, make cocklebur easy to identify. Burs are light brown, long and oval or oblong.2

Resistance statistics:

According to WeedScience.org:

*Resistance confirmation does not necessarily include all weeds and may vary among different areas of each state.

Weed management tips:

Scott Ditmarsen, field scientist, Dow AgroSciences, says:

  • Cocklebur occurs across the central and southern crop production areas.
  • Many soil-applied herbicides are relatively ineffective in controlling cocklebur. Postemergence herbicide applications often are required for effective control.
  • Scouting must be done early enough to allow timely application of postemergence herbicides.

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 Duo™ herbicide

Soybean

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

Enlist Duo™ herbicide

Additional Information:

More information can be found through these weed science resources:

1U.S. Department of Agriculture Natural Resources and Conservation Service website. PLANTS Profile. http://plants.usda.gov
2Wertz, B.A., and Lanin, T. Common Cocklebur. http://extension.psu.edu/pests/weeds/weed-id/common-cocklebur
3Virginia Cooperative Extension website. Virginia Tech Weed Identification Guide: Common Cocklebur. http://oak.ppws.vt.edu/scott/weed_id/xanst.htm

®™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, 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. Enlist Duo herbicide 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. Regulatory approval is pending for Enlist cotton. Always read and follow label directions. ©2015 Dow AgroSciences LLC