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NOXIOUS
WEED CONTROL AUTHORITY
3015 Menke Circle
Omaha, NE. 68134
(402) 444-4583
Spotted Knapweed
(Centaurea maculosa Lam.)
Life Span: Biennial (or short-lived perennial)
Origin: Eurasia
Reproduction: Seeds
Diffuse Knapweed
(Centaurea diffusa Lam.)
Life Span: Biennial (or short-lived perennial)
Origin:
Eurasia
Reproduction: Seeds
The reason these plants are considered noxious is:
1. They are very aggressive, infesting dry rangeland and
waste areas.
2. They are prolific seed producers.
3. They are highly competitive, even killing vegetation that
grows below them
Click on Pictures for Larger View
Spotted (Top)
Diffuse (Bottom
These two plants have not been on the noxious weed list
for very long, only since 1992.
They have yet to be located in Douglas County. Both plants are very difficult
to distinguish between each other in the rosette stage. Both plants behave
and look almost alike, but they have different blossom
bracts (under the flower), and the Spotted is usually purple, while the
Diffuse is usually white.
CONTROL
METHODS
For a more detailed description of Knapweeds,
check out the Nebraska Weed Control Association
Website.
For more information on Knapweeds in Douglas County,
please call 444-4583 or email DCNWC.