Description:
The roots are fibrous. The stem is robust and exudes milky juice
with broken. Lower portion of stem has dense arrangement
of long firm bulbous-based, simple hairs: stallate hairs
lacking. Multiple stems may arise from cauddex. Lower surfaces
of leaves contain hairs similar to those on the stem. Upper
surfaces of leaves are also similarly covered with
hairs, or are glabrous. Leaves oblong and narrowly tapered
to long petiole; leaf margins are flat, not rolled outward,
and are smooth. About 50 stem leaves, mainly clustered at
the base. Flowers bloom in between August and October, at
least in the Northeast, althought flowering appears to begin
earlier here. Fruits; Achenes 2.5 - 3.5 mm long; papus tan
to off white. Habitat is in forested openings, roadsides
and waste areas in lowland regions.
- Mechanical:
Nothing found specific. Mowing before seeds mature can prevent
dispersal.
- Biological:
Unknown.
- Herbicide:
Nother found specific to this weed, although control for Hieracium
species is similar to that of others. It can be controlled
with 2,4-D, clopyralid, and piclaram, and appropriate surfactants
are recommended.
For More Information:
Detailed information about noxious weeds is available at the Washington
State Noxious Weed Control Board Web Site. |
