|Method of Transportation:
|Vehicles, in hay and on/through animals.
|Open areas with well-drained soils such as grass-lands, roadsides, right-of-ways and open forests. Tolerant to dense shade.
Spotted knapweed (Centaurea biebersteinii) is a very competitive weed of dry open sites. It displaces desirable forage and native plant species reducing the landscape carrying capacity for livestock and wildlife.
Spotted knapweed grows up to 1.5 m tall and has purple (occasionally white) flowers found at the ends of branches. The flowerhead has black-tipped bracts ("scales") that give the plants a spotted appearance. It can act like a biennial or short-lived perennial. It has hairy, deeply-cut leaves that become smaller towards the top of the plant.
Land owners and managers have long recognized the need to control invasive plants to limit their impacts. In May 2018, a new smartphone app...
Bioagents are one tool in the fight against invasive plants, and they are intensly studied before release to ensure they won't switch to...