Research Finds Multiple Herbicide-Resistant Marestail is Present in New York

Joshua Putman, Field Crops and Forage Specialist
Southwest New York Dairy, Livestock and Field Crops Program

April 1, 2021
Research Finds Multiple Herbicide-Resistant Marestail is Present in New York

Thirty populations of marestail (horseweed) were collected in the fall of 2020 and are being screened for resistance to commonly used herbicides. Of the 30 collected, 27 appear to be resistant to glyphosate (Roundup) and 28 populations appear to be resistant to cloransulam herbicide, an ALS-inhibitor. This indicates that we have multiple-resistance in NY. It is also suspected that 4 of these 30 samples may be resistant to paraquat (Gramoxone) herbicide. The screening efforts will continue to evaluate the effect of products like 2,4-D and dicamba, Liberty, and PPO-inhibiting herbicides like Reflex and Sharpen.




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The 2025 Annual Conference starts Friday afternoon with a cash bar, registration, and annual membership meeting. Dinner to follow with keynote speaker Kevin Ochsner, Beef Farm of Excellence Awards Presentation, and Supreme Show Program Sponsorship auction. Trade show and silent auction to benefit the Jr Scholarship Fund all weekend long. Saturday starts with the trade show and breakfast at 8:00AM followed by speakers at 8:30AM. Lunch includes the Annual NYBPA Awards and Junior Awards Program. Hotel accommodations can be found below. Be sure to book your room today!  

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