Weed Watch: Giant Ragweed

 

Giant Ragweed

Giant ragweed is a fierce competitor — as one of the tallest annual weeds, it is extremely competitive for light and very difficult to control in many broadleaf crops. Complicated further by its emergence throughout the growing season and tolerance to many management tactics, it's important to control this weed before it controls your fields.1,2,3

 

Giant ragweed is native to North America and commonly found throughout the United States.4,5,6

 

Just one plant per 110 square feet reduced soybean yields by 50% 2

Keys to Managing Giant Ragweed1, 3, 4

  1. Rotate crops

    to diversify herbicide programs and weed control strategies.

  2. Start clean

    with a burndown herbicide or tillage.

  3. Apply a pre-emergence residual application,

    using a residual product within 2 weeks before planting or prior to crop emergence.

  4. Apply a postemergence application to target small weeds early,

    before weeds grow taller than 4 inches.

  5. Prevent Seed Production.

    If weeds escape, use tillage or physically remove them before plants produce seed.

1 Crop Science (Sep. 16, 2019). Ambrosia trifida. Retrieved from http://www.cropscience.bayer.com
2 Johnson, B., Loux, M., Nordby, D., Sprague, C., Nice, G., Westhoven, A., Stachler, J. (May 2007). Biology and management of giant ragweed. The Glyphosate, Weeds, and Crops Series. GWC-12. Retrieved from http://www.weedscience.missouri.edu
3 Crop Science (Sep. 17, 2019). How to manage and control ragweed in corn and soybeans. Retrieved from http://www.cropscience.bayer.us
4 Steckel, L, University of Tennessee Extension (June 2007). Giant ragweed. Retrieved from http://www.extension.tennessee.edu
5 University of Texas at Austin Lady Bird Johnson Wildflower Center Plant Database (Sep. 16, 2019). Ambrosia trifida. Retrieved from http://www.wildflower.org
6 Michigan State University (Sep. 17, 2019). Giant ragweed. Midwest Invasive Species Information Network. Retrieved from http://www.misin.msu.edu
7 Take Action. United States Soybean Board (Sep. 17, 2019). Giant ragweed. Retrieved from http://www.iwilltakeaction.com

The System Proven to Fight the Toughest Weeds

Tough-to-control weeds like giant ragweed can cause significant damage to your yield. See how Roundup Ready® Xtend Technology stacks up against competitors when controlling giant ragweed and more.
See the Comparison

No dicamba may be used in-crop with seed with Roundup Ready® Xtend Technology, unless and until approved or specifically permitted, and no dicamba formulations are currently registered for such use in the 2024 season. Please follow www.roundupreadyxtend.com/pages/xtendimax-updates.aspx for status updates.

Based on court ruling and EPA Existing Stocks Order* on XtendiMax® herbicide registration, Bayer has stopped its sale and distribution of XtendiMax® Herbicide. Visit our XtendiMax herbicide updates page to learn the latest.

*Low-volatility dicamba products subject to the ruling include XtendiMax® herbicide with VaporGrip® Technology, Engenia® herbicide and Tavium® Plus VaporGrip® Technology herbicide.

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XtendiMax® herbicide with VaporGrip® Technology is part of Roundup Ready® Xtend Technology, is a restricted use pesticide and must be used with VaporGrip® Xtra Agent (or an equivalent Volatility Reduction Adjuvant). For approved tank-mix products (including VRAs and DRAs), nozzles and other important label information visit XtendiMaxApplicationRequirements.com

ALWAYS READ AND FOLLOW PESTICIDE LABEL DIRECTIONS. XtendiMax® herbicide with VaporGrip® Technology is a restricted use pesticide. Not all products are registered in all states and may be subject to use restrictions. The distribution, sale, or use of an unregistered pesticide is a violation of federal and/or state law and is strictly prohibited. Check with your local dealer or representative for the product registration status in your state. For additional product information call toll-free 1-866-99-BAYER (1-866-992-2937) or visit our website at www.BayerCropScience.us. Bayer CropScience LP, 800 North Lindbergh Boulevard, St. Louis, MO 63167. ©2020 Bayer Group. All rights reserved.

NOT ALL formulations of dicamba, glyphosate or glufosinate are approved for in-crop use with products with XtendFlex® Technology. NOT ALL formulations of dicamba or glyphosate are approved for in-crop use with Roundup Ready 2 Xtend® soybeans. ONLY USE FORMULATIONS THAT ARE SPECIFICALLY LABELED FOR SUCH USES AND APPROVED FOR SUCH USE IN THE STATE OF APPLICATION. Contact the U.S. EPA and your state pesticide regulatory agency with any questions about the approval status of dicamba herbicide products for in-crop use with Roundup Ready 2 Xtend® soybeans or products with XtendFlex® Technology.

B.t. products may not yet be registered in all states. Check with your seed brand representative for the registration status in your state.

The RRXtend Spray App provides forecasts for locations within the contiguous United States. Do not use this app for forecasts outside the contiguous United States. Forecasts are for planning purposes only and are not a substitute for checking actual weather conditions at your location at the time of application and comply with the product label and other legal requirements.

Performance may vary, from location to location and from year to year, as local growing, soil and weather conditions may vary. Growers should evaluate data from multiple locations and years whenever possible and should consider the impacts of these conditions on the grower’s fields.

Roundup Ready® Xtend Technology contains genes that confer tolerance to glyphosate. Roundup Ready® 2 Technology contains genes that confer tolerance to glyphosate. Products with XtendFlex® Technology contains genes that confer tolerance to glyphosate, glufosinate and dicamba. Roundup Ready 2 Xtend® soybeans contain genes that confer tolerance to glyphosate and dicamba. Roundup Ready technology contains genes that confer tolerance to glyphosate, an active ingredient in Roundup® brand agricultural herbicides. Agricultural herbicides containing glyphosate will kill crops that are not tolerant to glyphosate. Glyphosate will kill crops that are not tolerant to glyphosate. Dicamba will kill crops that are not tolerant to dicamba. Glufosinate will kill crops that are not tolerant to glufosinate. Contact your seed brand dealer or refer to the Bayer Technology Use Guide for recommended weed control programs.

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