Stevens County Noxious Weed Control
Board This web site will help
you identify & control noxious weeds. Conventional & biological control
(BioControl) information and photographs are here. Maps & related
information are included.
Flowers are a small daisy-like flower with white petals and a raised
yellow/orange center
Leaves are alternate, very finely dissected looking almost fernlike
Unlike Mayweed chamomile it has no odor
Seeds are dark brown about 2mm long and have 3 broad ribs on one
side
Plants can reach a height of 3 feet
Biology and ecology
It can be an annual to a short lived perennial, reproducing only by
seed
It is a native of Europe
Flowers from June through October
Can produce anywhere from 10,000 to 200,000 seeds per plant
It is unpalatable to livestock
It grows on road sides, in waste areas and perennial forage crops,
thriving in low-lying areas that are poorly drained and only
periodically cultivated
Often confused with 3 other plants: Mayweed chamomile (dog fennel),
Oxeye daisy, and Pineappleweed, all of which are aromatic
Control
Prevention –
Learn to
identify plants; know your property
Biological – No known biocontrols in the U.S. but Canada has
released 3 different agents
Cultural – Good vegetative cover helps but does not prevent
establishment or spread
Mechanical – Cutting before it flowers will help prevent seed
production
Chemical – Several effective at label rates but should be
treated pre-bud to avoid seed production; may require repeat treatments
to kill root systems;
refer to the
PNW Weed Management Handbook for specific chemical recommendations,
listed in several of the crop sections
Photo L. D. Kemmet.
Where found –
Found
in many locations throughout Stevens County, especially around barns, in
overgrazed pasture areas, abandoned cropland.
