Bayer today marked the first U.S. delivery of Convintro™ herbicide, transported from its Kansas City manufacturing facility to New Century FS in Ruthven, Iowa. The milestone moves a new pre-emergent weed-control option closer to corn and soybean growers for the 2027 season.
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Convintro provides an early-season foundation that helps limit resistant weeds before they gain an advantage.
Convintro is designed to help manage resistant waterhemp and Palmer amaranth – two of agriculture’s most destructive super-weeds, with populations now showing resistance to up to nine different herbicide sites of action.1
Convintro brings Group 12 chemistry to U.S. corn and soybean production. Its active ingredient, diflufenican, inhibits carotenoid biosynthesis and adds a different site of action to integrated weed management programs.
“There’s more than herbicide on this truck – there’s a new chapter in the fight against resistant weeds,” said Kenin Eubank, Bayer U.S. Crop Protection Business Lead. “Helping growers tackle their toughest challenges is what drives us forward, and we’re excited to bring them another tool that addresses an urgent grower need while strengthening their broader weed-management toolbox.”
How Herbicide-Resistant Waterhemp and Palmer Amaranth Threaten Crop Yields
These resilient weeds can spread rapidly, produce large seedbanks and reduce yield potential, making a single weed escape costly for years.
- Waterhemp: Reported average yield reduction of 43% over three years when uncontrolled.2
- Palmer amaranth: Soybean yield potential can be reduced up to 79% when there are 2.5 plants per foot of row.3
- Seed Production: Without competition, each female waterhemp and Palmer amaranth plant can produce up to 1 million seeds.4
- Seed Dispersal: Seeds from these species can be spread by harvesting and tillage equipment, wildlife, flooding, manure or compost, and gravity. Strong winds can move seeds about 1,000 feet and pollen about 1,600 feet.5
Convintro Key Benefits and Product Highlights
Palmer amaranth and waterhemp can grow up to three inches per day and become difficult to control above 3 to 4 inches. Convintro provides an early-season foundation that helps limit resistant weeds before they gain an advantage.
- Weed Management: Targeted activity to help control early-season, pre-emergent Palmer amaranth and waterhemp in corn and soybeans.
- New Active Ingredient: Diflufenican is a Group 12 PDS inhibitor and a new active ingredient in the United States. It can be an important part of integrated weed management programs.
- Tank Mix Flexibility: A flexible partner for many groups of residual herbicides, helping growers customize programs for field-specific weed spectrum and resistance patterns.
- Extended Residual: Added residual activity during the critical early season, helping reduce pressure on post-emergence programs.
On the Way for the 2027 season
With EPA federal approval secured, Convintro is well on the way to providing another tool for weed management in corn and soybean production. Visit http://www.cropscience.bayer.us/ for comprehensive strategies, expert insights, to find your local Bayer representative, and to stay updated on state approval status in your region. For more information on Convintro, visit Convintro.us.
About Bayer
Bayer is a global enterprise with core competencies in the life science fields of health care and nutrition. In line with its mission, “Health for all, Hunger for none,” the company’s products and services are designed to help people and the planet thrive by supporting efforts to master the major challenges presented by a growing and aging global population. Bayer is committed to driving sustainable development and generating a positive impact with its businesses. At the same time, the Group aims to increase its earning power and create value through innovation and growth. The Bayer brand stands for trust, reliability and quality throughout the world. In fiscal 2025, the Group employed around 88,000 people and had sales of 45.6 billion euros. R&D expenses amounted to 5.8 billion euros. For more information, go to www.bayer.com.
| Sources | |
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1. |
International Survey of Herbicide Resistant Weeds. 2024. Species pages: Amaranthus palmeri; Amaranthus tuberculatus. https://www.weedscience.org/Pages/Species.aspx |
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2. |
Hager, A.G., Wax, L.M., and Stoller, E.W. 2009. Common waterhemp (Amaranthus rudis) interference in soybean. Weed Science. 50(5): 607-610. |
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3. |
I Will Take Action. 2024. Palmer amaranth (pigweed). https://iwilltakeaction.com/weeds/identification/palmer-amaranth-pigweed/ |
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4. |
Schwartz, L.M., Norsworthy, J.K., Young, B.G., Bradley, K.W., Kruger, G.R., Davis, V.M., Steckel, L.E., and Walsh, M.J. 2016. Tall waterhemp (Amaranthus tuberculatus) and Palmer amaranth (Amaranthus palmeri) seed production and retention at soybean maturity. Weed Technology 30:284-290. |
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5. |
Legleiter, T. and Johnson, B. 2013. Palmer amaranth biology, identification, and management. WS-51. Purdue Weed Science. Purdue Extension. Purdue University. https://www.extension.purdue.edu/extmedia/WS/WS-51-W.pdf |
ALWAYS READ AND FOLLOW PESTICIDE LABEL DIRECTIONS.
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 state department(s) of agriculture, local dealer or representative for the product registration status in your state. Not all products are registered for use in all states and may be subject to use restrictions. Bayer, Bayer Cross and Convintro™ are trademarks of Bayer Group. 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 LLC, 800 North Lindbergh Boulevard, St. Louis, MO 63167. ©2026 Bayer Group. All rights reserved.
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