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
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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Upcoming Events
MILKING IT: Moving Milk Quality Forward
April 14, 2026
Springville, NY
April 14th from 11am-1pm
Education sessions by:
- CCE SWNY Dairy, Livestock and Field Crops
- Springville Veterinary Services, P.C.
- Quality Milk Production Services
New York Application for Dairy of Distinction
April 15, 2026
Purpose of Program
Attractive dairy farms give the consumer greater confidence in the wholesomeness of milk and stimulate milk sales which encourages public support of the dairy industry. The award gives recognition to the dairy farmer for maintaining a well-kept farmstead.
Virtual Egg Count Training for Sheep and Goats
April 23, 2026 : Virtual Fecal Egg Count Training for Sheep and Goats
Amy Barkley and Rachel Moody, Livestock Specialists with Cornell Cooperative Extension, will take attendees through the why, how, and interpretation of fecal egg count testing for sheep and goats using the McMaster method.
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