September 27, 2012

Timing is everything, particularly with thistle control. Now through early November is one of the best times to apply herbicide for thistle control.

In the fall most thistle seedlings are in a small, flat, rosette growth form that is very sensitive to certain herbicides.

Among the most effective herbicide treatments for fall is a newer product called Milestone, or a combination of Milestone and 2,4-D called Forefront. Two other very effective herbicides are Tordon 22K and Grazon. (Tordon and Grazon also 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 or dicamba to the mix.

Other herbicides also can control thistles in pastures, including Redeem, Cimarron, and Curtail. No matter which weed killer you use, though, be sure to read and follow label instructions, and be sure to spray on time.

Next year, avoid overgrazing your pastures so stands get thicker and can compete better with any new thistle seedlings.

Bruce Anderson
Extension Forage Specialist