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Corteva Agriscience welcomes reclassification of propyzamide
The herbicide is a key tool for European farmers in managing weed resistance
GENEVA, Switzerland ‒ August 13, 2026 ‒ Corteva Agriscience welcomes the decision by the global Herbicide Resistance Action Committee (HRAC) to reclassify propyzamide following a scientific review of microtubule-active herbicides.
The updated classification from Group 3 to Group 23 reflects a deeper scientific understanding of how propyzamide works, recognizing its distinct mode of action and reinforcing its importance as a tool for managing herbicide resistance in European agriculture.
Propyzamide is currently the only active substance within HRAC Group 23 authorized for use in both the EU and Great Britain. It has been used by European growers for many years and has established a unique track record for reliable grassweed control and no cases of grassweed resistance to propyzamide have been reported worldwide in arable crops.
Olivier Couery, EMEA Marketing Leader, Herbicides, Corteva Agriscience, said: “This reclassification confirms propyzamide’s distinct mode of action and its critical role in helping European farmers maintain effective grassweed control.
“Propyzamide is particularly important in Northern and Central Europe, where around 85% of its use is in winter oilseed rape. At a time when herbicide resistance is increasing and weed-control options are becoming more limited, it is crucial European farmers maintain access to a broad toolbox of solutions to meet ever-evolving challenges.”
The reclassification reinforces the value of propyzamide in these cropping systems, where it gives growers an effective way to manage difficult grassweeds.
Oilseed rape is typically grown once every three or four years as part of a crop rotation with cereals such as wheat and barley. During the cereal years, grassweeds including black-grass and ryegrass can build up because farmers have fewer effective herbicide options available.
The oilseed rape phase provides an opportunity to tackle these weeds before the next cereal crop is planted, reducing weed pressure, protecting future yields and supporting integrated weed management.
Propyzamide is also widely used in more than 50 minor crops, including high-value crops such as chicory and grass seed where few alternative herbicides are available. Its use helps farmers maintain diverse cropping systems while effectively managing weeds.
About Corteva
Corteva, Inc. (NYSE: CTVA) is a global pure-play agriculture company that combines industry-leading innovation, high-touch customer engagement and operational execution to profitably deliver solutions for the world’s most pressing agriculture challenges. Corteva generates advantaged market preference through its unique distribution strategy, together with its balanced and globally diverse mix of seed, crop protection, and digital products and services. With some of the most recognized brands in agriculture and a technology pipeline well positioned to drive growth, the company is committed to maximizing productivity for farmers, while working with stakeholders throughout the food system as it fulfills its promise to enrich the lives of those who produce and those who consume, ensuring progress for generations to come. More information can be found at www.corteva.com.
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08/13/26
Contact Information
József Máté, Head of Communications, EMEA
Mob: +41 79 597 2709
jozsef.mate@corteva.com