Bannock County Noxious Weed Control
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Archive - Weed of the Month

2013

July

Rush Skeletonweed
Picture
Photo courtesy of www.fs.usda.gov
  • Perennial or biennial, up to 3 feet tall with wiry branched flower stems; lower stems have dense, bristly, downward-pointing hairs; milky sap.
  • Basal rosette leaves are lance-shaped, shallow lobed, with a pointed terminal lobe and lateral lobes opposite and usually pointing backward toward the leaf base; stem leaves are bractlike, often lacking. 
  • This plant has a taproot and lateral roots.
  • Flowers are bright yellow, strap-shaped, in axils or at the ends of branches.
  • Seeds are pale to dark-brown ribbed achene, disperse long distances in canyons, likely 1-5 miles, and survive fewer than 5 years.
  • Grows well on roadsides, rangelands, pastures, and grain fields.

May & June

Burr Buttercup














Picture
Picture
  • Winter annual that emerges, flowers, and sets fruits in the spring.
  • 2 or 3 inches tall, often in dense mats covering large areas of ground.
  • Flowers usually have 5 bright yellow petals and are less than 1/4 inch long.
  • Seeds are contained in a burr, 1/2 - 3/4 inch long, that develops from the blossom and changes from green to brown and dries out.
  • Leaves resemble a bird's foot, divided into finger-like segments and covered with fine hairs.
  • Stems are short and leafless and the plant has a small taproot.
  • Widespread in gardens, small grains, pastures, waste areas, and along roadsides.
  • HIGHLY TOXIC - especially when crushed.

March & April

Hoary Cress -
aka Whitetop
Picture
Photos courtesy of Weeds of the West.
  • Perennial; grows up to 2 feet tall.
  • Flowers are numerous, white, tiny, 4-petalled; in dense clusters at the top of each stem.
  • Leaves are gray-green, lance-shaped, with hairy surfaces.
  • Seeds are small, flat, and reddish brown inside upside-down heart-shaped, often 2-lobed pods.
  • Seeds remain viable for about 4 years.

January & February

Kochia
Picture
Although Kochia is not on the Idaho Noxious Weed list, it is very common and can cause a lot of problems with road and parking lot maintenance.

  • An annual plant with a deep taproot and grows 1 1/2 to 5 feet tall.
  • Stems are upright, branched and have hairs on the upper parts of stems, sometimes tinged red.
  • Leaves are alternately arranged and are 1 to 2 inches long. They are narrow to lance shaped with smooth, hairy edges and may have silky hairs on leaf undersides. 
  • Flowers are small and green, grouped in clusters in the upper leaf axils and on terminal spikes.
  • Each flower forms a small inflated seed bearing structure that is covered by the sepals.  Seeds are wedge-shaped and light brown.
  • Kochia reproduces from seeds, it typically produces around 14,600 seeds per plant.  Seeds are dispersed in the fall when the plant becomes a tumbleweed.
  • These plants are found on pasture, rangeland, roadsides, ditch banks, wastelands and cultivated fields.

2012

November
&
December

White Bryony
Picture
  • Climbing perennial vine up to 50 feet in length with tendrils.
  • Thick, fleshy roots that resemble a large turnip.
  • Leaves are palmately 5-lobed, triangular, up to 5 inches long, and rough to the touch.
  • Flowers are greenish-white, 5-petaled, 1/2 inch across, and in clusters in the leaf axils.
  • Seeds are a spherical berry, 5/16 inch in diameter, green turning to black when mature.
  • ALL PARTS OF THE PLANT ARE POISONOUS, BUT ESPECIALLY THE ROOT!
  • Grows up power poles, fence rows, and trees.
  • Seeds disperse long distances by birds.
  • Resembles kudzu and native clematis in its growth habit.
  • Please help us find these aggressive weeds!  Give us a call if you find one.

October

Salt Cedar
Picture
  • Shrub or small tree up to 24 feet tall.
  • Long taproot with lateral roots.
  • Leaves are small, scale-like, gray-green & overlapping along the stem.
  • Flowers are pale or dark pink with 5 distinct petals; inflorescence panicle-like.
  • Seeds are a capsule with a tuft of long hair.
  • Exudes salt from foliage.
  • Root & stem fragments float on water for medium to long-distance dispersal.
  • Seeds disperse at least 100 yards in light wind & remain viable less than 1 year.

September

Leafy Spurge
Southeast Idaho
  • Erect perennial up to 2 1/2 feet tall with roots exceeding 20 feet in depth.
  • Milky sap is toxic to humans & livestock.
  • Flowers are a pair of showy, yellowish-green, heart-shaped bracts with tiny flower clusters.
  • Leaves are nearly opposite & narrow.
  • Roots are long, both vertical & horizontal.  Creep horizontally.
  • Seeds disperse less than 15 feet & remain viable for at lease 8 years.
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  • Home
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  • Community Interaction
    • Community Interaction
    • Education
    • Board of Directors
    • Equipment Rentals
  • Noxious Weed Control
    • Noxious Weed Control
    • Noxious Weed Facts
    • What Can You Do?
    • Request Service
    • No Spray Request Form
    • Idaho Code on Noxious Weeds
    • Program Application
  • Weed Identification
    • Weed Identification
    • Idaho Noxious Weeds
    • Bannock County Noxious Weeds
    • Archive - Weed of the Month
  • Contact Us
    • Contact Us
    • Our Staff
    • Employment
    • Helpful Links