Spotted Knapweed Management
Cultural, Mechanical, & Biological Management
These methods of control are similar to those for diffuse and Russian knapweed.
Herbicide Control
Some herbicides are labeled for control of spotted knapweed. Those that can be used independently or in combination with each other are: Picloram (Tordon), clopyralid (Stinger), dicamba (Banvel), 2,4-D, and a premix of clopyralid and 2,4-D (Curtail). Picloram has been found to be most effective. 2,4-D,when used alone, results in poor control.
Herbicide |
Rate (per acre) |
Application Time |
Remarks |
Tordon 22K |
1 pt. |
Apply in spring prior to stem elongation and/or to rosettes in the fall. |
n/a |
Banvel + 2,4-D Amine |
1 pt. + 1 pt. |
Apply in spring prior to stem elongation and/or to rosettes in the fall. |
n/a |
Curtail |
2 qts. |
Apply in spring after majority of basal leaves emerged to pre-bud stage. |
Apply in enough total spray volume to ensure good coverage. |
Read the label to insure the herbicide is labeled for your application site.
Spotted Knapweed Identification
Additional Information
CSU Fact Sheet # 3.110 - Diffuse & Spotted Knapweed
Adams County Extension web pages do not endorse any commercial providers or their products, other herbicide applications may be possible. Consult with your local pesticide dealer,county weed supervisor, or extension agent for specific recommendations. Always read and follow label instructions when making any application.
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Last updated 12-16-2003
