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Transcript
Meadow knapweed Flowers are pink to purplish-red with light to dark brown fringed bracts that can give a golden sheen appearance to infestations Flower heads are larger than either spotted or diffuse knapweed Grows up to 3 ½’ tall with many branches Leaves may be entire, coarsely lobed, or toothed but not divided as in diffuse or spotted knapweed Biology and ecology A perennial plant spreading by seeds A fertile hybrid between brown and black knapweed It is a native of Europe This plant is found in throughout the Pacific northwest; denser populations in western WA but some sites known in Pend Oreille County It invades fields and pastures as well as roadsides, open forests, and moist areas Control Prevention – Learn to identify plants; start monitoring early in the season Biological – Larinus minutus is effective and widespread in our county Cultural – Plant competitive cover crop Mechanical – Does not tolerate tillage but may need to be done more than once; grazing or mowing not effective unless it is done continuously, small areas can be pulled or dug Chemical – There are many products on the market listed for control of knapweeds such as; 2,4-D, dicamba, glyphosate: refer to the PNW Weed Management handbook for specific chemical recommendations Cindy Roche, www.forestryimages.org Key identifying traits Sunflower Family Cindy Roche, www.forestryimages.org Centaurea jacea x nigra Where found – At this time we are not aware of any infestations in Stevens County Stevens County Noxious Weed Control Board, February 2007 Eric Coombs, OR Dpt AG, www.forestryimages.org