Horticulture-+Russian+Knapweed

= Russian Knapweed =

(Acroptilon Repense)
Perennial (lives 3 or more years) .



Interesting Facts
Alleopathic (releases herbicide to kill all others plants near it) Seeds and creeping rhizomes are used for reproduction. Toxic to horses. Bracts can have fine hairs,egg shape, and a papery margin which help you distinguish this from spotted knapweed. Russian Knapweed is distinguishable from spotted knapweed by is black roots that are 8 or more feet long and go deep. Russian Knapweed has a distinguishably different leaf than Diffused Knapweed.Diffuse Knapweed Russian Knapweed has smooth papery bracts that lack spines. Russian Knapweed shoot and leaves and have a rosette emergance in the spring. Watch this video for more information []

Control
Hand pulling difficult and ineffective Deep plowing is fairly effective Mowing very ineffective Burning ineffective Chemical- 2,4D dicambia, plicoram, clopyralid Research for your specific area Biological- Subanguina picridis a nematode that kills the Russian Knapweed Grazing animals is severly discouraged due to the fact that the knapweed is toxic to horses and it is not a good control method.

Impacts
crowds out the native species takes over feilds