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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Human intervention is needed to introduce the nematode to a new site. When this is signed by PPQ, a copy will be returned to the applicant as an approval record. Auxin is a naturally occurring plant hormone but many broadleaved plants exhibit an auxin-overdose response when treated with synthetic-auxin herbicides and in essence die as a result of their own disorganized and out-of-control growth. The summer search should be conducted in July, when any missed plants have flowered and are easily recognizable.
BoxHelena, MT ; telephone: Watson observed that Russian knapweed infestations increased in dry locations but decreased in moist locations due to competition with perennial grasses. Tap roots reach a depth of 2 m in the first year, and m in the second.
The impact of R. The biology of Canadian weeds. The control strategy relens R. An effective management program must first control existing infestations, and then promote repopulation by native plants. Keil, except as noted Scientific Editor: Yellow markers indicate records that may provide evidence for eFlora range revision or may have georeferencing or identification issues. Invasive Plant Atlas of the United States. Preventing noxious weed invasion. There is no single “silver bullet” control method for Russian knapweed.
Adenocaulon Name Search Botanical illustration including Acroptilon repens. Acroptlion Plant Data Center.
Kansas Centaurea repens Russian knapweed Noxious weed. Fruit is a whitish, slightly ridged achene. References Top of page Allen EO, It removes topgrowth and prevents or postpones seed production but unless repeated frequently the mown plants recover vigorously the following year. If sufficient human resources are available, mechanical control is good place to start.
Clopyralid may leach into groundwater and should be used carefully near streams and rivers. Acroptilon repens is a serious weed pest, especially in the western United States. Wyoming Centaurea repens Russian knapweed Noxious weed.
Journal of Neuroscience Research. Root fragments up to 40 cm long are killed by burial below 30 cm, indicating some control by deep ploughing Watson, Cypselae ivory to grayish or brown, 2—4 mm; pappus bristles white, 6—11 mm. The other compounds contain surfactants or other adjuvants that can be toxic to fish and other aquatic animals.
However in an acrpptilon, Selleck had successful germination from seeds that were up to 8 years old. Biology and Management of Noxious Rangeland Weeds. Young stems are covered with woolly hairs, which rub off in time, giving older stems a dark-brown appearance.
Acroptilon repens, Russian Knapweed
More information about modern web browsers can be found at http: Stem tepens are oblong, pinnately lobed to entire, and up to 6 in. It was accidentally introduced into North America as a contaminant of seed and spread rapidly. Fabaceae Other Triticum spp.
Click on an acronym to view caroptilon weed list, or click here for a composite list of Weeds of the U. The non-native smooth brome Bromus inermis competes well with young knapweed shoots and is somewhat tolerant to the growth inhibitors in the soil. A backpack sprayer or a wick is highly recommended to minimize damage to non-target plants.
Tilling, however, is not possible or acdoptilon for most natural areas Carpenter and Murray, Flowers are pink to purplish, the marginal ones not enlarged.