Cultural
Control of
Noxious Weeds
Cultural
Control by Category
Cultural Control
Links By Category
category
1: 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)
(b) field
bindweed (Convolvulus arvensis)
(c) whitetop
or
hoary cress (Cardaria draba)
(d) leafy
spurge (Euphorbia esula)
(e) Russian
knapweed (Centaurea repens)
(f) spotted
knapweed (Centaurea maculosa)
(g) diffuse
knapweed (Centaurea
diffusa)
(h) common
tansy (Tanacetum vulgare L.)
(i) Dalmatian
toadflax (Linaria dalmatica)
(j) St.
Johnswort (Hypericum perforatum)
(k) sulfur
(erect) cinquefoil (Potentilla recta)
(l) common tansy
(Tanacetum vulgare L.)
(m) ox-eye daisy
(Chrysanthemum leucanthemum L.)
(n) houndstongue
(Cyfnoglossum officinale L.)
(o) hoary
alyssum (Berteroa incana)
(p) 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)
(c) yellow
starthistle (Centaurea solstitialis)
(d)
Eurasiam
watermilfoil (Myriophyllum spicatum)
(e)
flowering
rush (Butomus umbellatus)
(f) 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.