Weed and Pest Declared List (By County)
W.S. 11-5-102(a)(vii) “"Declared pest" means any animal or insect which the board and the Wyoming weed and pest council have found, either by virtue of its direct effect, or as a carrier of disease or parasites, to be detrimental to the general welfare of persons residing within a district;”
W.S. 11-5-102(a)(viii) “"Declared weed" means any plant which the board and the Wyoming weed and pest council have found, either by virtue of its direct effect, or as a carrier of disease or parasites, to be detrimental to the general welfare of persons residing within a district;”
W.S. 11-5-105(a)(vi) “Participate in programs for the control of declared weeds and declared pests not included on the designated list. Such programs do not qualify for cost-sharing from the department.”
Procedures Defined by Wyoming Rules and Regulations:
Chapter 42. Board of Agriculture – Weed and Pest Rules and Regulations
Section 4.Declared Pest and Declared Weed Program Participation Under W.S. 11-5-105(b)(vi). Albany County Converse County Big Horn County Halogetonglomeratus (M. Bieb.) C.A. Mey.
Centaurea iberica Trev. ex Spreng.
Centaurea iberica Trev. ex Spreng.
Medusahead Taeniatherum caput-medusae (L.) Nevski
Centaureavirgata Lam. ssp. squarrosaErodium cicutarium (L.) L’Her. ex Ait.
Centaureavirgata Lam. ssp. squarrosaHieraciumfendleri Sch. Bip.
Sphaerophysasalsula (Pallas) DC.
Ceratocephalatesticulata (Crantz)
Hieraciumfendleri Sch. Bip.
Grindelia squarrosa (Pursh) Dunal
Campbell County
Puncturevine Tribulus terrestris L.
Erodium cicutarium (L.) L’Her.ex Ait
Cirsium undulatum (Nutt.) Spreng.
Carbon County Halogetonglomeratus (M. Bieb.) C.A. Mey.
Weed and Pest Declared List (By County)
Crook County Natrona County Grindelia squarrosa (Pursh) Dunal
Halogetonglomeratus (M. Bieb.) C.A. Mey.
Puncturevine Tribulus terrestris L.
Fremont County
Puncturevine Tribulus terrestris L.
Swainsonpea Sphaerophysa salsula (Pallas) DC.
Niobrara County Goshen County
Puncturevine Tribulus terrestris L.
Orgyia pseudotsugata (McDunnough),
Hot Springs County Park County
Puncturevine Tribulus terrestris L.
Johnson County Erodium cicutarium (L.) L’Her. Ex Ait.
Delphinium occidentale (S. Wats.) S.
Platte County
Puncturevine Tribulus terrestris L.
Laramie County
Puncturevine Tribulus terrestris L.
Puncturevine Tribulus terrestris L.
Sheridan County Heterotheca villosa (Pursh) Shinners
Puncturevine Tribulus terrestris L.
Lincoln County Sublette County Cicutadouglasii (DC.) J.M. Coult. &
Cicutadouglasii (DC.) J.M. Coult. &
Weed and Pest Declared List (By County)
Sweetwater County Weston County Grindelia squarrosa (Pursh) Dunal
Puncturevine Tribulus terrestris L.
Zigadenusvenenosus S. Watson
Gutierrezia sarothrae (Pursh) Britton &
Teton County Cenchrus longispinus (Hack.) Fern.
Astragalus bisulcatus (Hook.) Gray
Centaureavirgata Lam. ssp. squarrosa (Willd.) Gugler
Hieraciumfendleri Sch. Bip.
Uinta County Washakie County Centaurea iberica Trev. ex Spreng.
Taeniatherum caput-medusae (L.) Nevski
Puncturevine Tribulus terrestris L. Purple starthistle
Centaureavirgata Lam. ssp. squarrosa (Willd.) Gugler
Swainsonpea Sphaerophysa salsula (Pallas) DC. Tansy ragwort
Delphinium occidentale (S. Wats.) S. Wats.
Hieraciumfendleri Sch. Bip.
(***) Note: Russian olive (Elaeagnus angustifolia L.) was added to
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Weed and Pest Declared List (By County)
W.S. 11-5-102(a)(vii) “"Declared pest" means any animal or insect which the board and the Wyoming weed and pest council have found, either by virtue of its direct effect, or as a carrier of disease or parasites, to be detrimental to the general welfare of persons residing within a district;”
W.S. 11-5-102(a)(viii) “"Declared weed" means any plant which the board and the Wyoming weed and pest council have found, either by virtue of its direct effect, or as a carrier of disease or parasites, to be detrimental to the general welfare of persons residing within a district;”
W.S. 11-5-105(a)(vi) “Participate in programs for the control of declared weeds and declared pests not included on the designated list. Such programs do not qualify for cost-sharing from the department.”
Procedures Defined by Wyoming Rules and Regulations:
Chapter 42. Board of Agriculture – Weed and Pest Rules and Regulations
Section 4. Declared Pest and Declared Weed Program Participation Under W.S. 11-5-105(b)(vi). 
Weed and Pest Declared List (By County)
Crook County 
Weed and Pest Declared List (By County)
Sweetwater County