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
Chainsaw Safety & Forestry BMP's
June 13, 2025
Belmont, NY
Perfect for beginners or experienced users needing a refresher. We'll cover safety features and basic maintenance of the modern saw and learn kickback prevention techniques. Participants will be able to try on various PPE and learn ergonomic practices. Interested participants will learn to safely start up, throttle up, and turn off a saw. You may bring our own saw if you choose, there will be no cutting in this class.
FAMACHA Workshop at Alfred State College
June 14, 2025 : FAMACHA Workshop at Alfred State College
Alfred, NY
Join Cornell Cooperative Extension for a morning of classroom learning, hands-on FAMACHA and 5 Point Check practice, and a pasture walk at Alfred State College's teaching farm to learn about putting IPM to work on pasture using evasive grazing techniques. An exam will be provided, and students passing the exam will receive program certification, including a FAMACHA Card.
Fecal Egg Count Mobile Workshop at Alfred State College
June 17, 2025 : Fecal Egg Count Mobile Workshop at Alfred State College
Alfred, NY
This mobile workshop will teach you what you need to know to perform fecal egg counts and understand the results of fecal egg count reduction tests at home. While focused on testing sheep and goats, this event is applicable to all ruminants and camelids.