Press Release •  9/7/2022

Ranchers, Land Managers Have Flexible New Tool for Fall Weed Control

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HighNoon™ Herbicide from Corteva Agriscience Stops Weeds Nearly Anywhere They Grow

INDIANAPOLIS, Sept. 7, 2022 — Drought and drought recovery make this fall an especially important time to control many of the toughest broadleaf weeds across the West. New HighNoon™ herbicide from Corteva Agriscience gives ranchers, land managers and county noxious weed specialists the flexible tool they need to help manage those challenges across the diverse Mountain West region.

“Fall treatments offer many advantages,” said Will Hatler, Range & Pasture field scientist with Corteva Agriscience. “When late-season moisture germinates new weeds or stimulates regrowth, eliminating those unwanted thirsty plants helps moisture go to growing grass and rangeland recovery, rather than to growing weeds.”

Biennial species that emerge in the fall, such as musk thistle and yellow starthistle, are more easily controlled in the delicate rosette stage of growth. With perennial weeds, such as Canada thistle, knapweeds and rush skeletonweed, fall treatments are more effective — especially after a light frost — because the herbicide rides along as plants move winter food reserves into their roots.

Application Flexibility

Introduced earlier this year, HighNoon herbicide provides a single product that controls more than 140 broadleaf weeds and delivers lasting residual control across a wide range of sites.

“In many states where noxious and invasive weeds pose the primary broadleaf weed threat, there is significant crossover among rangeland, pasture, roadsides and other non-crop use sites,” Hatler said.

HighNoon gives ranchers, county noxious weed directors and vegetation managers working on grazing land, roadsides, utility substations or rights-of-way a weed control option that simplifies the job.

“Residual control is important for fall applications, especially during drought,” Hatler said. “As moisture brings on new weed flushes, HighNoon stays on the job, keeping weeds out of the way well into next spring, which can help speed rangeland recovery.”

HighNoon, part of Corteva’s leading portfolio of crop protection solutions, is available in Colorado, Idaho, Montana, Nevada, Oregon, Utah, Washington and Wyoming. Visit to learn more.

Perennial Canada thistle can sprout from seeds or from its massive root system. This new growth is especially susceptible to fall herbicide applications.

Spotted knapweed threatens grazing land and wildlife habitat across the West. Fall is an excellent time to make serious progress against this invasive weed.


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About Corteva Agriscience Range & Pasture

Drawing on more than 70 years of Range & Pasture improvement products and service as The Dow Chemical Company, DowElanco and, most recently, Dow AgroSciences, Corteva Agriscience is the industry-leading provider of weed and brush management solutions for grazing lands. Producers can rely on Corteva for best-in-class herbicides, including DuraCor®, PastureGard® HL, Remedy® Ultra, MezaVue® and many more, along with technology-based solutions, such as LandVisor™ advanced brush management, and service offerings, including UltiGraz℠ Pasture Weed & Feed. With a specialized team dedicated to Range & Pasture management, Corteva offers producers the expertise they need, leading products, a robust new product development pipeline and superb custom services.

About Corteva Agriscience

Corteva, Inc. (NYSE: CTVA) is a publicly traded, 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

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Trademarks of Corteva Agriscience and its affiliated companies. Under normal field conditions, HighNoon is nonvolatile. HighNoon has no grazing or haying restrictions for any class of livestock, including lactating dairy cows, horses (including lactating mares) and meat animals prior to slaughter. Label precautions apply to forage treated with HighNoon and to manure and urine from animals that have consumed treated forage. HighNoon is not registered for sale or use in all states. Contact your state pesticide regulatory agency to determine if a product is registered for sale or use in your state. Consult the label for full details. Always read and follow label directions.



Larissa Capriotti
+55 (11) 9 9358-4006

Erik Johnson
Bader Rutter