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.
Field Crops
Dairy
Business
Livestock
Grains
Upcoming Events
Fecal Egg Count Mobile Workshop - Ellicottville
November 5, 2025 : Fecal Egg Count Mobile Workshop - Ellicottville
Ellicottville, NY
This workshop will explain why regularly testing fecal egg counts can help you with understanding your animals' parasite loads and dewormer resistance. Attendees have the opportunity to prepare and evaluate fresh fecal samples under the microscope and practice interpretations.
Animal Mortality Composting Demo
November 6, 2025 : Animal Mortality Composting Demo
Brant, NY
Join experts from Cornell's Waste Management Institute, Local Soil and Water Conservation Districts, Pro-Dairy, CCE, and WNY Crop Management as we evaluate a newly constructed livestock compost pile at a local dairy farm. Attendees will be able to learn how to properly design a pad and pile, evaluate pile success, and understand common pitfalls to proper composting.
Optimizing the Economic Return of Pasture-Raised Slow-Growth and Conventional Broilers - Webinar
November 13, 2025 : Optimizing the Economic Return of Pasture-Raised Slow-Growth and Conventional Broilers - Webinar
Over the past three years, Cornell Cooperative Extension has worked with nearly 40 small farmers across NYS to gather information on the true costs of raising broilers (meat chickens) on pasture. This presentation is a summary of the findings of this research project.
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