Most thistle seedlings this fall will be small, in a flat, rosette growth form, and very sensitive to certain herbicides.
Several herbicides are effective and recommended for thistle control. Maybe the most effective is a newer herbicide called Milestone. Tordon 22K and Grazon also are effective, but require care since they can kill woody plants, including trees you might want to keep. 2,4-D also works well while it’s warm, but you will get better thistle control by using a little less 2,4-D and adding a small amount of Banvel to the mix.
Other herbicides like Redeem, Ally and Curtail also help control thistles in pastures.
No matter which weed killer you use, be sure to read and follow label instructions and be sure to spray on time. Next year, avoid overgrazing your pastures so your grass stands get thicker and compete with any new thistle seedlings.
Give some thought now to thistle control during October and November. Your pastures can be cleaner next spring.
Bruce Anderson
Extension Forage Specialist
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