Convintro™ Herbicide Receives EPA Approval: Bayer's New Tool Against Resistant Palmer Amaranth and Waterhemp

Breakthrough Group 12 Chemistry Targets Resistant Weeds Across U.S. Cropland

ST. LOUIS (July 1, 2026) - Bayer announced today that the U.S. EPA has granted a federal registration for Convintro™, a breakthrough Group 12 pre-emergent herbicide for corn and soybeans. Convintro delivers targeted activity against resistant Palmer amaranth and waterhemp-two of agriculture's most destructive super-weeds that now show resistance to up to 9 different herbicide sites of action^¹.

Group 12: Important Chemistry for U.S. Agriculture

Instead of targeting the same sites of action that resistant weeds have already conquered², Convintro's Group 12 chemistry will offer farmers another solution against resistant Amaranthus species. Convintro brings an important active ingredient to these weeds in the U.S., diflufenican, which inhibits carotenoid biosynthesis at the phytoene desaturase (PDS) step.

"Diflufenican has been used for years in other countries for managing broadleaf weeds in certain crops," said Katilyn Price, Crop Protection Technical Product Lead for Bayer. "The introduction of diflufenican as a critical active ingredient for corn and soybean use is a first for U.S. farmers and will be an additional tool to help them manage Amaranthus species."

"Convintro gives us a new tool to rotate and mix, which is exactly what we need," said Price continues. "This will be an extremely important tool in the toolbox to add that extra residual and that added efficacy to help combat populations of waterhemp resistant to currently used sites of action."

Key Benefits and Product Highlights

• 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 offering a new active ingredient in the U.S., which can be a key part of integrated weed management programs
• Tank Mix Flexibility: Excellent tank mix partner providing flexibility to customize programs for specific field needs with other herbicide groups
• Extended Residual: Continued protection throughout the critical early season

Integrated Weed Management Approach
Understanding that every farm faces unique challenges, Convintro offers exceptional tank mix flexibility with many groups of residual herbicides, allowing farmers to customize their approach based on their specific weed spectrum and resistance patterns. Convintro offers effective control of Amaranthus species but will need to be tank mixed with other herbicides, such as group 14 or 15, to provide full spectrum weed control.
"When it comes to weed management, a best practice is still to use multiple modes of action," said Price. "Management plans that cover multiple years and crops will help farmers avoid issues like resistance."

Addressing Foliar Response with Transparency
Convintro's effectiveness against tough resistant weeds requires strong chemistry. After application, some transient crop discoloration may occur. In Bayer internal trials, this temporary foliar response has been followed by recovery with new growth, and on average, yield potential has not been impacted.
"Waterhemp has continued to build resistance to current herbicides, and we need powerful residual products to take the pressure off of our post programs," said Price.

Critical Timing and Availability
The approval of Convintro comes at a critical time for U.S. farmers facing increasing challenges from resistant weed species. With resistant Palmer amaranth and waterhemp now capable of devastating crop profitability in a single season, having access to a new active ingredient could represent the difference between successful farming and economic disaster for many operations.

While EPA registration represents a major milestone, Convintro also requires individual state approval before use in that state. Bayer is actively working with state regulatory agencies to complete this process, with availability expected to vary by region for the 2027 growing season.

Ready to Take Action
With EPA federal approval secured, Convintro is well on the way to provide another tool for weed management in corn and soybean production. Visit 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.

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 2024, the Group employed around 93,000 people and had sales of 46.6 billion euros. R&D expenses amounted to 6.2 billion euros.

Media Contact:
Bayer Crop Science Communications
Kyel Richard: 573.356.0241 | [email protected]

Sources
1. International Survey of Herbicide Resistant Weeds. (2024). Species pages: Amaranthus palmeri; Amaranthus tuberculatus. https://www.weedscience.org/Pages/Species.aspx
2. Heap, I. (2024). International Survey of Herbicide Resistant Weeds. www.weedscience.org

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