Noxious Weeds in Montana
[Pictures of these
noxious weeds
- slow download] [What is a weed?]
[Line Drawings]
[What
the
Heck are Weeds?] [Plant Terms Glossary]
[ Weed ID Links]
[Weed Fighting
Companies] [Contact Montana Weed
Fighters]
category 1: (15 weeds) - Category 1 noxious weeds
are weeds
that are
currently established and generally widespread in many counties of the
state.
Management criteria includes awareness and education, containment and
suppression
of existing infestations and prevention of new infestations.
These
weeds are capable of rapid spread and render land unfit or greatly
limit
beneficial uses.
(a) Canada
thistle (Cirsium arvense)
Version 2
(b) common
tansy (Tanacetum vulgare L.)
(c) Dalmatian toadflax (Linaria dalmatica)
(d) diffuse knapweed (Centaurea diffusa)
(e) field bindweed (Convolvulus arvensis)
(f) hoary alyssum
(Berteroa incana)
(g) houndstongue
(Cynoglossum officinale L.)
(h) leafy
spurge (Euphorbia esula)
(i) ox-eye
daisy (Chrysanthemum leucanthemum L.)
(j) Russian
knapweed (Centaurea repens)
(k) spotted knapweed (Centaurea maculosa)
(l) St. Johnswort (Hypericum perforatum)
(m) sulfur
(erect)
cinquefoil (Potentilla recta)
(n) whitetop
or hoary cress (Cardaria draba)
(o) yellow
toadflax (Linaria
vulgaris)
category
2: Category 2
noxious weeds have recently been introduced into the state or are
rapidly spreading from their current infestation sites. These
weeds are capable of rapid spread and invasion of lands, rendering
lands unfit for beneficial uses. Management criteria includes
awareness and education, monitoring and containment of known
infestations and eradication where possible.
(a) blueweed (Echium vulgare)
(b) purple loosestrife
or
lythrum (Lythrum salicaria,
L. virgatum, and
any hybrid crosses thereof)
(c) tansy
ragwort (Senecio
jacobea L.)
(d) meadow hawkweed
complex (Hieracium pratense, H. floribundum, H.
piloselloides)
(e) orange
hawkweed (Hieracium
aurantiacum L.)
(f) tall buttercup (Ranunculus acris L.)
(g) tamarisk
[saltcedar] (Tamarix spp.)
(h) Perennial
pepperweed (Lepidium
latifolium)
(i) rush skeletonweed
(Chondrilla juncea)
(j) yellow
flag iris
(Iris pseudacorus)
category
3: Category 3 noxious weeds have not been detected in the state
or may be found in only small, scattered, localized infestations.
Management criteria includes awareness and education, early detection,
and immediate action to eradicate infestations. These weeds are
known pests in nearby states and are capable of rapid spread and render
land unfit for beneficial uses.
(a) common
crupina (Crupina vulgaris)
(b) dyers
woad (Isatis
tinctoria) yellow
starthistle (Centaurea solstitialis)
(c) Eurasian
watermilfoil (Myriophyllum
spicatum)
(d) flowering
rush (Butomus umbellatus)
(e) Japanese
knotweed (Polygonum spp. [P. cuspidatum, P. sachalinense & P. polystachyum])
category 4: Watch
list. Category 4 plant species are plants that are invasive and
may cause significant economic or environmental impacts if allowed to
become established in Montana. Research and monitoring for
category 4 plant species may result in future listing as a category 1,
2, or 3 noxious weed in Montana. Plant species designated as a
category 4 plant are prohibited from sale in or into Montana.
AUTH: sec. 80-7-802, MCA. IMP: sec. 7-22-2101, MCA.
(a) Scotch
broom (Cytisus
scoparius)
Reason: The montana Dept. of Agriculture received recommendation from
the Noxious Weed List Committee to create a Category 4 designation and
to list scotch broom in this category. The intent of Category 4
listings is to prohibit nursery trade for plants that are invasive and
may cause significant economic or environmental impacts if allowed to
become established in Montana.
mtwow.org
HOME
Page updated March,
2008.