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Posts Tagged ‘home_weeds’

Dalmation Toadflax

Tuesday, June 25, 2013 AT 06:06 PM

Linaria dalmatica

This plant is a perennial growing up to 3 feet tall.

Reproduced from spreading rootstocks and seeds.

Leaves are alternate with smooth margins, waxy, and with a broad base that partially clasps the stem.

Flowers are borne in axis on the upper leaves are are 2-lipped, 1/4 to 2 1/2 inches long with a long spur at the bottom. They are yellow with an orange bearded throat.

Dalmatian toadflax was introduced from Europe as an ornamental plant. It has the ability to crowd out desirable native plants and can seriously impact wildlife and livestock that depend on native vegetation. The extensive root and waxy leaf make it difficult to control. This plant is found along the Platte River Parkway path in Casper and along the north face of Casper Mountain.


Chemical control can be very difficult due to the waxy leaves. Chemical application is made in the fall. Contact your local weed and pest for specific recommendations.


Mecinus janthinus stem-boring weevils feed on the foliage. The larvae feed within the stems which can cause shoot death and reduced flower and seed production.

Leafy Spurge

Saturday, June 1, 2013 AT 07:06 PM

Euphorbia esula

This is a perennial growing to 3 feet tall.

Leaves are alternate, narrow and lance-shaped.

Stems grow in dense clusters.

Flowers are yellowish-green, small, arranged in many small clusters. The base of each flower has a pair of heart-shaped bracts that look like petals and are the same yellowish-green color.

Seeds are in a pea green, 3-celled capsule.

Roots are dark purplish-brown with numerous pink buds which can produce new shoots or roots. This plant reproduces from an aggressive rootstock and from seed. The roots of this plant can grow 20ft into the soil!

All parts of this plant contain a milky sap.

This plant is a HUGE problem in the West and has ruined millions of acres for wildlife and livestock. In Natrona County it is found mainly in two locations: the Rattlesnake Range and the Hat Six Area.



Chemicals may be applied at bloom stage or after a summer dry period when plants begin to grow. Please call your local weed district for specific recommendations.


Aphthona flea beetle larvae feed on root hairs and root tissues while the adults feed on leaves.

Spotted Knapweed

Saturday, June 1, 2013 AT 05:06 PM

Centaurea maculosa

This is a biennial or short-lived perennial growing up to 3 feet tall.

It reproduces by seed and each plant can produce up to 1,000 seeds per plant.

Flowers are single, vase-shaped, and pinkish-purple. The involucre bracts are stiff and tipped with a dark comb-like fringe which gives the base a “spotted” appearance.

Leaves are grayish-green, alternate, and upper leaves are very reduced.

Spotted knapweed was introduced into the US as a contaminant in alfalfa seed from Asia in the early 20th century. It is now found in every county of every state west of the Mississippi! Highly competitive, this plant can rapidly take over native range and destroy habitat for wildlife and livestock.  In Natrona County it is found mainly in the Casper area and along the highways .


Chemicals must be applied before the plant produces seed to be effective. Contact your local weed and pest for specific chemical recommendations.


There are currently seven species of biocontrol insects released on this plant in Natrona County.


Cut, pull, or dig up before seed production.