How to treat knapweed #618278 - Ask Extension


How to treat knapweed #618278

Asked March 22, 2020, 11:41 PM EDT

Hello, I have a pasture near Lexington that has knapweed. I'm not sure which species. I have a couple acres that is heavily infested, beyond what I can effectively spot spray or hand pull. I plan to broadcast spray it with herbicide. I would like to know the best time to apply herbicide, what type of herbicide is most effective, and at what rate. Thank you-

Morrow County Oregon

Expert Response

UC Davis has an excellent article regrading spotted knapweed that explains the various control options. As with any chemical application, the label will provide the most current information, so please follow its direction.
An Expert Replied March 27, 2020, 1:50 PM EDT

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