Today's Acre

Take Action Against Resistant Weeds

No matter the weed challenge, environment or growing conditions, U.S. soybean and cotton farmers rely on the Roundup Ready® Xtend Technology

Knowledge often equals power — especially when it comes to taming tough-to-control and resistant weeds. Devising a herbicide management plan is an easier task when you know what you're combating.

If you farm soybeans or cotton, chances are that you are all too familiar with four of the nation's most prolific weeds. But how well do you really know these enemies?

 

Giant ragweed

Giant ragweed is a competitive weed that is adapted to the fertile soil crop production acres of the Midwest and Eastern Corn Belt. It quickly grows above crops to compete for sunlight and create a dense canopy with its 4- to 8-inch-wide leaves.

Herbicide Recommendations

  1. Start weed-free at planting. Take full advantage of early-emerging populations by controlling all emerged weeds with tillage or an effective burndown.
  2. Suppress late-emerging weeds through the use of a residual herbicide, either in combination with a burndown or at planting in a tilled seedbed.
  3. Finish strong with multiple postemergence applications to control dense infestation of giant ragweed, especially in populations that exhibit extended emergence.
 

Kochia

Kochia is competitive with crops and problematic in fallow periods between crops. Early-emerging kochia can reduce crop yields by 70% or more and can interfere with harvest.

Herbicide Recommendations

  1. Rotate crops to help diversify kochia-control strategies and herbicide programs over time.
  2. Start clean. It is imperative to control kochia in early spring because of its emergence patterns, dense populations and difficult-to-control large plants.
  3. Apply an effective soil-applied, pre-emergence herbicide.
  4. Target small weeds after they emerge.
  5. Prevent seed production. Strategic tillage and cover crops might be helpful in minimizing kochia seed production.
 

Marestail (Horseweed)

Horseweed competes with soybeans throughout the growing season and reduces crop yield. It matures in late summer or early fall and produces up to 200,000 seeds per plant, which are readily dispersed by wind.

Herbicide Recommendations

  1. Use fall or early spring herbicide treatments in fields where horseweed seedlings are observed.
  2. Apply effective burndown herbicides in spring. Do not plant into existing stands of horseweed. Start weed-free at planting.
  3. Include residual herbicides with the preplant-burndown treatment.
  4. In Roundup Ready 2 Xtend® soybeans, a postemergence application of XtendiMax®herbicide with VaporGrip® Technology, Roundup PowerMAX® herbicide and Warrant® Herbicide (with an approved DRA) will control horseweed plants that emerge after planting and also prevent a new flush of weeds from emerging later in the season.
 

Waterhemp

Waterhemp is a prolific seed producer and able to produce as many as 1.5 times more seeds than most other pigweed species.

Herbicide Recommendations

  1. The most effective strategies to reduce herbicide-resistant waterhemp populations will integrate cultural and mechanical techniques with chemical control. Right before or after soybean planting, apply a full rate (according to label guidelines for soil type and organic matter content) of an effective pre-emergence, soil-residual herbicide.
  2. Apply an effective postemergence herbicide with an overlapping residual herbicide.
  3. Scout the field within seven to 14 days after the initial postemergence application to determine treatment effectiveness. If there are still surviving plants present, remove these plants from the field before they reach a productive growth stage.

Ask your local agronomist for herbicide management recommendations tailored to your county and growing conditions, and visit IWillTakeAction.com for additional details on common and costly weeds.

Courtesy Take Action Pesticide-Resistance Management, 2019 United Soybean Board.

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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.

Bayer is a member of Excellence Through Stewardship® (ETS). Bayer products are commercialized in accordance with ETS Product Launch Stewardship Guidance, and in compliance with Bayer’s Policy for Commercialization of Biotechnology-Derived Plant Products in Commodity Crops. Commercialized products have been approved for import into key export markets with functioning regulatory systems. Any crop or material produced from this product can only be exported to, or used, processed or sold in countries where all necessary regulatory approvals have been granted. It is a violation of national and international law to move material containing biotech traits across boundaries into nations where import is not permitted. Growers should talk to their grain handler or product purchaser to confirm their buying position for this product. Excellence Through Stewardship® is a registered trademark 0f Excellence Through Stewardship.

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.

Insect control technology provided by Vip3A is utilized under license from Syngenta Crop Protection AG. 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. LibertyLink® and the Water Droplet Design® is a trademark of BASF Corporation. Respect the Refuge and Corn Design® is a registered trademark of National Corn Growers Association. Bayer, Bayer Cross, Bollgard II®, Bollgard®, Fontanelle Hybrids and Design®, Hubner Seed & Design™, Hubner Seed™, Jung Seed Genetics & Design®, Leaf Triangle Design®, Lewis Hybrids and Design®, Lewis Hybrids™ , REA Hybrids and Design™, Respect the Refuge and Cotton Design®, Roundup Ready 2 Xtend®, Roundup Ready 2 Yield®, Roundup Ready®, Roundup®, Specialty Hybrids™, Stewart and Design™, Stone Seed & Design™, ThryvOn™, VaporGrip® and XtendFlex® are trademarks of Bayer Group. All other trademarks are the property of their respective owners. © Bayer Group. All rights reserved.

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