Gina Darin. Acroptilon repens, a dicot, is a perennial herb that is not native to California; it was introduced from elsewhere and naturalized in the wild. Acroptilon repens (Linnaeus) de Candolle in A. P. de Candolle and ; Acroptilon picris (Pallas ex Willdenow) C. A. Meyer; C. picris Pallas ex Willdenow. Acroptilon repens. In: Fire Effects Information System, [Online]. U.S. Department of Agriculture, Forest Service, Rocky Mountain Research Station, Fire Sciences.
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In humans, the EPA has found that acropilon exposures to picloram could cause weakness, diarrhea, weight loss, and central nervous system damage. What is the best way and place to report the occurrence of an invasive species?
What are invasive species and why should we be concerned about them? However, it does not share some characteristics common to the genus Centaureaand has been placed in the genus Acroptilon. The involucre is slenderly ovoid, pale, and about 1 cm high. Picloram is not expected to bioconcentrate in aquatic organisms.
Distribution and amount of four knapweed Centaurea L. Russian knapweed invades disturbed grassland and shrubland communities, as well as riparian forests. This compound can remain in the soil at some level for several years. Fabaceae Other Triticum spp. Synonyms listed by Ochsmann are Centaurea picris Pallas ex Willd.
Weeds of the West. The other compounds contain surfactants or other adjuvants that can be toxic to fish and other aquatic animals.
US Fish and Wildlife Service, a. Aggressive monitoring,followed by a combination of mechanical, chemical, and biological control, is needed to remove an infestation.
In addition, Russian knapweed is very poisonous to horses, causing neurological symptoms. It removes topgrowth and prevents or postpones seed production but unless repeated frequently the mown plants recover vigorously the following year.
The stems of Acroptilon repens are erect, thin, stiff, corymbosely branched, cm 18 to 36 in tall, and when young are covered with soft, short, gray hair.
Acropptilon  reported that the plant extends radially in all directions and can cover an area of 12 m 2 within 2 years. A movement disorder similar to Parkinson’s disease, is reported to be caused in horses ingesting Russian knapweed.
Acroptilon repens, Russian Knapweed
Herbicide application and planting of Russian wildrye provided a competitive monoculture 7 to 9 years after treatment in Wyoming. Please consider upgrading your browser to the latest version or installing a new browser.
Persistent herbicides in compost. Bonnie Million, National Park Service, bugwood.
State agriculture or natural resource departments. Russian knapweed is repene avoided by grazing animals scroptilon can be poisonous to horses.
Hand pulling or cutting the plants to kill the tops will starve the roots if done repeatedly, but this might not be a practical solution. US Fish and Wildlife Service, 22 pp. Acroptilon australe Iljin Acroptilon obtusifolium Cass.
It is more competitive than other weedy species in occupying disturbed areas. Rosette leaves are oblanceolate, irregularly pinnately lobed or almost entire, cm long, and Jepson eFlorahttp: Tap roots reach a depth of 2 m in the first year, and m in the second. The primary means of long-range seed dispersal is probably via livestock and wildlife seeds remain viable after gut passagecontaminated hay and other seed primarily lucerneor by movement of farm machinery or other vehicles.
Areas should be monitored three times a year spring,summer, and fall and acroptilno plants should be destroyed immediately.
SEINet Portal Network – Acroptilon repens
Notes on Natural Enemies Top of page Accroptilon. Don’t need the entire report? Distribution Maps Top of page You can pan and zoom the map.
Physiology and Phenology R. Discussion View source History. Chemical Control In general, herbicides should only be used as a last resort and as part of an integrated vegetation management programme. Some sources then continue to place it as the sole member of the monotypic genus Acroptilon. References Repfns of page Allen EO, Glyphosate is rapidly inactivated upon contact with soil and so will not suppress germination or seedling emergence if applied to the soil.
Ash Meadows Gumplant Grindelia fraxino-pratensis.