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Home » Keywords » herbicide resistance

Items Tagged with 'herbicide resistance'

ARTICLES

Palmer amaranth is becoming a serious threat in the Pacific Northwest

Palmer amaranth is rapidly spreading in the PNW, with widespread herbicide resistance. Effective control requires layered herbicide programs, managing escapes and integrated practices to prevent yield loss and long-term infestations.
April 7, 2026
Albert Adjesiwor

Palmer amaranth continues to pose a serious and growing challenge to crop production systems in the Pacific Northwest (PNW). As of the fall of 2025, there have been more than 160 Palmer amaranth detections in PNW, affecting 9,000 acres of cropland in Idaho and nearly 700 acres in Oregon.


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Integration of forage crops for managing herbicide-resistant weed seedbanks in Northeastern cropping systems

March 12, 2026
Vipan Kumar and Mark J. Renz

Weed control is becoming increasingly challenging for field crop producers across the Northeastern United States, including New York (N.Y.). Several factors are driving this trend, including the introduction of new and invasive weed species, the growing prevalence of herbicide resistance, increasing cost of herbicide premixes, and unpredictable weather that often limits timely field operations.


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Managing wild oats: Winning the war in your small grains

Wild oats are a persistent threat in small grains, producing up to 250 seeds that can survive for years. By staying vigilant, using diverse control strategies and thinking ahead, you can manage wild oats and safeguard your crop yields.
May 16, 2025
Albert Adjesiwor

Wild oats (Avena fatua) – they’re fast, sneaky and persistent. If you’re a small-grain producer, you already know this grassy weed can rob you of yield, quality and profits. But here’s the good news: With smart strategies, you can turn the tables.


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Assessing new weed management issues in the Pacific Northwest

The University of Idaho and partners are surveying Pacific Northwest farmers to assess weed management strategies and address herbicide-resistant weeds, supported by the PNW Herbicide Resistance Initiative.
December 9, 2024
Nick Bergmann, Doug Finkelnburg, and Pat Hatzenbuehler

To help answer these questions, we have designed a study and outreach plan that focus on better characterizing the ways in which weed management among PNW farmers and ranchers has changed in recent years and the different approaches that have been taken in response. 


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The growing challenge of herbicide resistance in Idaho's beets and beyond

Herbicide resistance poses a growing challenge in Idaho agriculture, impacting crop yields and driving farmers to adopt diverse strategies beyond chemicals for effective weed control.
May 22, 2024
Julia McCarthy

“I’m an optimist, but I have seen fields overrun by kochia, and last year we learned that we have Palmer amaranth and waterhemp,” says Dr. Albert Adjesiwor, University of Idaho Extension weed scientist in Kimberly.


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Effective weed control in an uncertain regulatory environment

By knowing your target and preparing agronomic and business contingency plans, you can help hedge your bets against uncertainty in the marketplace.
May 16, 2024

Every day, farmers deal with variables out of their control, from weather to mechanical issues to weed pressure. In recent weeks, a new variable has affected many U.S. growers.


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Glyphosate-resistant Palmer amaranth and tall waterhemp in Northeast—A new frontier

March 12, 2024
Vipan Kumar

Two new pigweed species including Palmer amaranth (Amaranthus palmeri S. Watson) and tall waterhemp (Amaranthus tuberculatus (Moq.) Sauer), which are commonly found in midwestern and southern United States, have been identified recently in the Northeastern (NE) region. 


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Herbicide-resistant weed management strategies

March 11, 2023
Mike Hunter

One or more herbicide-resistant weed specie can be found in every state in the Northeast and are present in major crop production areas across the country.


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