Knapweed Management: Russian Knapweed
Russian knapweed (Apcroptilon repens L.) is a creeping perennial that reproduces from seed and
vegetative root buds. Russian knapweed is toxic to horses. Diffuse knapweed is another invasive member of the knapweed complex.
Russian Knapweed Control
The best management plan for Russian knapweed includes cultural control combined with mechanical or chemical control.
Suppressing Russian knapweed with herbicides, then sowing perennial grasses such as smooth brome or Russian wild rye,
will help prevent reinvasion. Some herbicides may require more than one application to be effective. Avoid using herbicide
rates that injure grasses because effective competition will be reduced.
Read the label. You must follow the label directions for all pesticides to get the best results.
Failure to follow labeled instructions may result in poor control, environmental damage, and wasted time, money and resources.
If you have questions, contact a crop consultant, Extension specialist or County Extension Agent.
For more information, contact an Extension Specialist or your County Extension Agent.
Southwestern Noxious/Invasive Weed Spotted & Russian Knapweed:
Based on information from George Beck, Extension Weed Specialist, Colorado State University,
gbeck@lamar.colostate.edu
Click the following link for the audio file on knapweeds:
Spotted & Russian Knapweed
Click for problems with the audio file.
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Richard Lee: It's been reported that spotted knapweed species are responsible for a 42 million dollar economic loss in Montana.
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Narrator: The best strategy for controlling knapweed is to suppress infestations by chemical or mechanical means, then re-seed with desirable grasses. |
| Narrator: For more information, contact a state Extension specialist or your local County Extension Agent. |
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