Press Release •  3/22/2022

HighNoon™ Herbicide From Corteva Agriscience Simplifies Rangeland Weed Control

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Ranchers, Land Managers Get Application Flexibility Across Multiple Sites

INDIANAPOLIS, March 22, 2022 — New HighNoon herbicide from Corteva Agriscience gives ranchers, land managers and county noxious weed specialists the flexible tool they need to help manage the toughest broadleaf weeds across the diverse Mountain West region.

Stewarding the land, water and other natural resources in geographies where land-use goals are as unique as the varying soils, elevations and habitats presents special challenges. HighNoon helps simplify land stewardship, whether managing for livestock grazing, wildlife and game birds or maintaining roadsides and rights-of-way, or — as often the case — a combination of objectives.

“In many states where noxious and invasive weeds pose the primary broadleaf weed threat, there is significant crossover among rangeland, pasture, roadsides and other noncrop use sites,” explained John Kalthoff, Category Lead at Corteva Agriscience. “Ranchers, county noxious weed directors and vegetation managers working on roadsides, utility substations or rights-of-way need a weed control option that simplifies the job. HighNoon does that — without sacrificing results.”

HighNoon contains the same active ingredients as DuraCor® herbicide, providing a single product that controls broadleaf weeds, delivers residual weed control and stops several undesirable woody species — but with application flexibility across a wide range of sites.

HighNoon supports an abundant, high-quality forage base by taking out the toughest-to-control broadleaf weeds and woody plants, including biennial thistles (musk thistle, bull thistle), perennial Canada thistle, Palmer amaranth, wild carrot, poison hemlock, common burdock, pigweed, common mullein, common tansy, whitetop, houndstongue, buckbrush, and many others.

Enhancing annual grass control programs

The recent rise of winter annual grasses across many Western states poses a relatively new threat against varying land-use goals. Whether it’s ventenata, medusahead or cheatgrass (downy brome), dealing with these species has grown in importance among rangeland managers.

These grasses offer minimal forage value to livestock or wildlife, crowd out perennial forage grasses, create monocultures ill-suited for grazing or habitat and pose a serious wildfire threat. Treatment programs can be effective, but most leave bare ground. Nature commonly fills these voids with broadleaf weeds — often invasive species.

HighNoon provides tank-mix flexibility with most annual grass control products, adding a critical broadleaf weed control component to these programs.

“HighNoon plays an important role in integrated programs designed to reclaim rangeland lost to winter annual grasses,” Kalthoff said. “Often, these programs incorporate reseeding with competitive perennial forage grasses.” Including HighNoon helps keep broadleaf weeds at bay until the newly seeded grasses take off.

Corteva anticipates HighNoon will be available for the 2022 treatment season across the Mountain West states, specifically west of the Missouri River in North Dakota and South Dakota, plus Montana, Wyoming, Colorado, Utah, Idaho and Nevada, and the eastern two-thirds of Washington and Oregon. Visit to learn more.

New HighNoonTM herbicide is highly effective against perennial Canada thistle (pictured), biennial thistles and more than 140 other weeds.

Tank-mix flexibility with HighNoon™ herbicide brings critical broadleaf weed control to ventenata and other annual grass control programs.


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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 and service marks of Corteva Agriscience and its affiliated companies. MezaVue® is a Restricted Use Pesticide. Under normal field conditions, DuraCor® and HighNoon™ are nonvolatile. DuraCor and HighNoon have 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 DuraCor or HighNoon and to manure and urine from animals that have consumed treated forageDuraCor, HighNoon and MezaVue are 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. UltiGraz with dry fertilizer is available with specific herbicides in the states of AL, AR, FL, GA, IA, KS, KY, LA, MO, MS, NC, ND, NE, OK, OR, SC, SD, TN, TX, VA, WA and WV. State restrictions on the sale and use of Remedy® Ultra apply. Consult the label before purchase or use for full details. Always read and follow label directions.



Kasey Anderson
317-337-4478 office

Karli Pryor
Bader Rutter
707-290-3288 cell