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Recent Designated Weed – Russian Olive

A growing problem in Carbon County, and the State of Wyoming as well, is Russian Olive. As of 2007, Russian Olive was officially added to the Wyoming Designated Weeds List and therefore is considered a threat and requires proper management. Russian Olive is an invasive treelike plant that is now commonly found along stream beds, river banks, and canyon bottoms. It was originally introduced to the United States as a ornamental shade tree and used in windbreaks but has since escaped and has now become a serious invader.

Russian Olive
Russian Olive (Elaeagnus angustifolia)
Silver Buffaloberry
Silver Buffaloberry (Shepherdia argentea)

One problem that has been encountered when identifying Russian Olive trees is that it is often mistaken for a similar plant known as Silver Buffaloberry. Silver Buffaloberry and Russian Olive look very similar from a distance, but upon closer inspection the differences are quite apparent. First of all, Silver Buffaloberry is not a tree but rather a shrub. It has no definite trunk. Second, although both plants are found along stream beds and both reach a similar height of around 5-6m tall, they produce very different types of fruit. The fruit is often the distinguishing factor. Russian Olive trees produce an olive shaped fruit, whereas the Silver Buffaloberry produces small red berries that hang in bunches from its thorny limbs.

State & County Weed Lists

Carbon County Declared List
W.S.S.  11-5-102(a)(xi)

  1. Halogeton (Halogeton glomeratus (Bieb.) C.A. Mey)
  2. Mosquito (Culicidae spp.)
  3. Plains pricklypear (Opuntia polycantha Haw.)
  4. Plains larkspur / Geyer larkspur (Delphinium geyeri Green)
  5. Wyeth lupine (Lupinus wyethii S. Watts)
  6. Black Hembane (Hyoscyamus niger L.)
  7. Common cocklebur (Xanthium strumarium L)

Designated Noxious Weeds .S. 11-5-102 (a)(xi)
Prohibited Noxious Weeds W.S. 11-12-104

(1) Field bindweed (Convolvulus arvensis L.)
(2) Canada thistle (Cirsium arvense L.)
(3) Leafy spurge (Euphorbia esula L.)
(4) Perennial sowthistle (Sonchus arvensis L.)
(5) Quackgrass (Agropyron repens (L.) Beauv.)
(6) Hoary cress (whitetop) (Cardaria draba and Cardaria pubescens (L.) Desv.)
(7) Perennial pepperweed (Lepidium latifolium L.)
(8) Ox-eye daisy (Chrysanthemum leucanthemum L.)
(9) Skeletonleaf bursage (Franseria discolor Nutt.)
(10) Russian knapweed (Centaurea repens L.)
(11) Yellow toadflax (Linaria vulgaris L.)
(12) Dalmatian toadflax (Linaria dalmatica (L.) Mill.)
(13) Scotch thistle (Onopordum acanthium L.)
(14) Musk thistle (Carduus nutans L.)
(15) Common burdock (Arctium minus (Hill) Bernh.)
(16) Plumeless thistle (Carduus acanthoides L.)
(17) Dyers woad (Isatis tinctoria L.)
(18) Houndstongue (Cynoglossum officinale L.)
(19) Spotted knapweed (Centaurea maculosa Lam.)
(20) Diffuse knapweed (Centaurea diffusa Lam.)
(21) Purple loosestrife (Lythrum salicaria L.)
(22) Saltcedar (Tamarix spp.)
(23) Common St. Johnswort (Hypericum perforatum)
(24) Common Tansy (Tanacetum vulgare)
(25) Russian olive (Elaeagnus angustifolia L.)

Designated Pests W.S. 11-5-102 (a)(xii)

(1) Grasshoppers
(2) Mormon crickets
(3) Prairie dogs
(4) Ground squirrels
(5) Mountain pine beetle
(6) Beet Leafhopper

Recent Designated Weed | Weeds And Pests | Established Weeds | Weed Invaders | Poisonous Weeds | Pests