Attachment_3_TCWP_Priority_Weed_Chart_2024_priority.pdf
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Teton County Weed & Pest District - Priority Species Chart
This document is a priority species classification chart maintained by the Teton County Weed & Pest District, updated April 23, 2024, that categorizes invasive plants, insects, and aquatic species into five threat levels to guide management and control efforts within Teton County, Wyoming.
The chart categorizes species across six classification levels: Priority 1 (rare infestation with eradication goals), Priority 2 (local infestation requiring aggressive control), Priority 3 (regional infestation with containment focus), Priority 4 (widespread infestation requiring maintenance), Education Only, and Watch List. Priority 1 species include common teasel, diffuse knapweed, dyers woad, and garlic mustard, representing highly invasive plants found in extremely low numbers that pose the highest threat to native plant communities and land value. Priority 2 species such as curleyleaf pondweed and Eurasian watermilfoil are found in low numbers and require aggressive control on all known infestations. Priority 3 and Priority 4 species, including spotted knapweed, Canada thistle, and ox-eye daisy, are established throughout localized areas or countywide, respectively, requiring containment and maintenance rather than eradication. The Watch List contains approximately 50 species including African rue, Asian carp, emerald ash borer, and zebra mussel that are not currently present in Teton County but are considered highly invasive by other states and organizations; these would be treated as Priority 1 if detected. Management strategies across all priority levels emphasize early detection, rapid response, biological control measures, best management practices, and public education to maintain native plant communities and preserve wildlife habitat and land value.
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Text version
updated: 4/23/2024
Species Priority
Priority
Priority
Priority
Education
Only Watch
List Common teasel (Dipsacus fullonum L.) x Curleyleaf pondweed (Potamogeton crispus L.) x x Diffuse knapweed (Centaurea diffusa Lam. ) x Dyers woad (Isatis tinctoria L.) x Eurasian watermilfoil (Myriophyllum spicatum L.) x x Garlic mustard (Alliaria petiolata (M. Bieb.) Cavara & Grande) x Hawkweed, Orange & Meadow (Heiracium aurantiacum L. and H. caespitosum Dumort.) X Knotweed complex (Reynoutria spp. ) X Meadow knapweed (Centaurea x moncktonii C.E.) X Medusahead (Taeniatherum caput-medusae (L.) Nevski) X Moth mullein (Verbascum blattaria L.) X Perennial pepperweed (giant whitetop) (Lepidium latifolium L.) X Puncturvine (Tribulus terrestris L.) X Purple loosestrife (Lythrum salicaria L.) X Rush skeletonweed (Chondrilla juncea L.) X Russian knapweed (Rhaponticum repens (L.) Hidalgo) X Saltcedar (Tamarix spp. ) X Scotch thistle (Onopordum acanthium L.) X Squarrose knapweed (Centaurea virgata Lam.) X Ventenata (Ventenata dubia (Leers) Coss.) X Waterhyacinth (Eichhornia crassipes (Mart.) Solms) X X Water lettuce (Pistia stratiotes L.) X Yellowflag iris (Iris pseudacorus L.) X Yellow starthistle (Centaurea solstitialis L.) X Austrian fieldcress (Rorippa austriaca (Crants) Bess.) X Baby's breath (Gypsophila paniculata L.) X Chicory (Cichorium intybus L.) X Common St. Johnswort (Hypericum perforatum L.) X Cypress spurge (Euphorbia cyparissias L.) X Leafy spurge (Euphorbia esula L.) X Myrtle spurge (Euphorbia myrsinites L.) X Plumeless thistle (Carduus acanthoides L.) X Russian olive (Elaeagnus angustifolia L.) X Yellow chamomile (Anthemis tinctoria L.) X Absinth wormwood (Artemisia absinthium L.) X Cheatgrass (Bromus tectorum L.) X Common burdock (Arctium minus (Hill) Bernh.) X Common Tansy (Tanacetum vulgare L.) X Dalmatian toadflax (Linaria dalmatica (L.) Mill.) X Dames Rocket (Hesperis matronalis L.) X Field bindweed (Convolvulus arvensis L.) X Field Scabious (Knautia arvensis (L.) Coult.) X Hoary alyssum (Berteroa incana (L.) DC.) X Hoary cress (whitetop) (Lepidium draba L. and Lepidium appelianum Al-Shehbaz) X Ox-eye daisy (Leucanthemum vulgare Lam.) X Poison hemlock (Conium maculatum L.) X Spotted knapweed (Centaurea stoebe L.) X Sulfur cinquefoil (Pontentilla recta L.) X Tall buttercup (Ranuculus acris L.) X
State Designated County Declared
Teton County Weed & Pest District - Priority Species Chart
Species Priority
Priority
Priority
Priority
Education
Only Watch
List Yellow toadflax (Linaria vulgaris Mill.) X Bittersweet nightshade (Solanum dulcamara L.) X Black henbane (Hyoscyamus niger L.) X Bulbous bluegrass (Poa bulbosa L.) X Bull thistle (Cirsium vulgare (Savi) Ten.) X Canada thistle (Cirsium arvense (L.) Scop.) X Common mullein (Verbascum thapsus L.) X Houndstongue (Cynoglossum officinale L.) X Musk thistle (Carduus nutans L.) X Perennial sowthistle (Sonchus arvensis L.) X Quackgrass (Elymus repens (L.) Gould) X Scentless chamomile (Tripleurospermum inodorum (L.) Sch. Bip.) X Skeletonleaf bursage (Ambrosia tomentosa Nutt.) X Mosquito (Culicidae ssp)
Grasshoppers Native Ground squirrels Native Mormon crickets Native Mountain pine beetle Native Beet Leafhopper Not in TC Prairie dogs Not in TC African rue (Peganum harmala) x Asian carp (Hypophthalmichthys nobilis & H. molitrix ) x Asian longhorned beetle (Anoplophora glabripennis ) x Asian rockpool mosquito (Ochlerotatus japonicas ) x Asian tiger mosquito (Aedes albopictus ) x Bouncing bet (Saponaria officinalis) x Brazilian elodea (Egeria densa ) x Brown marmorated stink bug (Halyomorpha halys ) x Common bugloss (Anchusa officinalis) x Common crupina (Crupina vulgaris) x Common reed (Phragmites australis) x Costmary (Tanacetum balsamita) x Elongated mustard (Brassica elongata ) x Emerald ash borer (Agrilus planipennis ) x Flowering rush (Butomus umbellatus) x Goatsrue (Galega officinalis) x Spongy moth (Lymantria dispar ) x Hydrilla (Hydrilla verticillata) x Iberian starthistle (Centaurea iberica) x Mediterranean sage (Salvia aethiopis) x Palmer Amaranth (Amaranthus palmeri) x Parrot feather milfoil (Myriophyllum aquaticum ) x Policeman's helmet (Impatiens glandulifera ) x Purple starthistle (Centaurea calcitrapa) x Quagga mussel (Dreissena rostriformis ) x Scotch broom (Cytisus scoparius) x Spotted wing drosophilia (Drosophila suzukii ) x Summer pheasant’s-eye (Adonis aestivalis) x Tansy ragwort (Senecio jacobaea) x Thesium (Thesium ramosum ) x Knapweed complex (Centauria spp) x Viper's Bugloss (Echium vulgare ) x Water Chesnut (Eleocharis dulcis ) x comprehensive integrated program for nuisance & disease prevention
Zebra mussel (Dreissena polymorpha ) x
Priority 4: Widespread infestation. No tolerance of further spread, control and maintenance of current weed infestations: Weeds in this category are established throughout Teton County in large numbers. They are highly invasive, their further spread poses a significant threat to non-infested native plant communities, and they currently render land unfit for wildlife and livestock grazing, and reduce land value and recreation. Containment of current infestations through the use of best management practices and biological control, stopping further spread through early detection and rapid response of known non-infested areas along with education will be used to maintain these weeds at their present level.
Watch List: Species not currently known in Teton County and are not on the state designated or Teton County declared noxious weed list, but are considered by other states and other organizations to be highly invasive and pose a significant threat to native ecosystems of the west. The District considers these species as Priority 1 if detected.
Priority 1: Rare Infestation. No tolerance, with a goal of eradication upon detection: Weeds in this category are considered by Teton County Weed & Pest to be highly invasive, pose the highest threat to native plant communities, are known to render land unfit for wildlife and livestock grazing, reduce land value and recreation, and are found or were previously found in extremely low numbers in Teton County. Early detection and rapid response along with noxious weed education will be used with a goal to eradicate these weeds.
Priority 2: Local Infestation. No tolerance, aggressive control on all known infestations: Weeds in this category are considered by Teton County Weed & Pest to be highly invasive, pose a high threat to native plant communities, are known to render land unfit for wildlife and livestock grazing, reduce land value and recreation, and are found in low numbers in Teton County. Containment and reduction of current infestations, early detection and rapid response of new infestations, use of biological control measures, along with noxious weed education will be used to control, reduce numbers, and in certain circumstances eradicate.
Definitions
Priority 3: Regional Infestation. No tolerance of further spread from their established locations, control and maintenance of current weed infestations and aggressive control to areas otherwise free of these weeds: Weeds in this category are established in large numbers in localized areas only. They are highly invasive, their further spread poses a significant threat to non-infested native plant communities, and they currently render land unfit for wildlife and livestock grazing, and reduce land value and recreation. Containment of current infestations through the use of best management practices and biological control, stopping further spread through early detection and rapid response of known non-infested areas along with noxious weed education will be used to maintain, control, and reduce weed numbers.
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