Be a weed warrior & Take 10 ... (minutes) ... to stop Diffuse Knapweed in its tracks!
1. Wear gloves.
2. Pull or dig out the plant, including the long taproot. When pulling prior to flowering, you can leave plant on ground to decompose.
Be a weed warrior & do the Western Salsify SNAP CRACKLE POP!
SNAP off the flower or seed head to prevent the wind from spreading the seeds. Put it into a plastic bag -- listen for the CRACKLE -- or your pocket to carry home. POP the entire plant and taproot out of the ground and leave it to compost onsite.
More information on weed control from the Methow Conservancy.