Russian knapweed, hardheads, creeping knapweed, mountain bluet, turkestan thistle acroptilon repens russian knapweed is a perennial forb family asteraceae found in isolated patches throughout california. To investigate the chemical constituents of acroptilon repens. Russian knapweed acroptilon repens is a creeping herbaceous perennial weed that is currently invading new mexico. Russian knapweed is a nonnative, deeprooted perennial that spreads by aggressive, creeping, horizontal roots rhizomes and seeds. The panel on phytosanitary measures considered that the weed acroptilon repens was not an alert situation. Ecology and management of russian knapweed acroptilon.
Invasive russian knapweed acroptilon repens creates. This plant is toxic to horses and crowds out native species. Russian knapweed, a widely distributed perennial broadleaf plant, is listed as a class b noxious weed in california. Invasive russian knapweed acroptilon repens creates large patches almost entirely by rhizomic growth volume 10 issue 2 john f. Pdf phytotoxic polyacetylenes from roots of russian. It is a strong competitor in infested areas, often forming dense colonies, and has allelopathic effects on other plants growing nearby. Russian knapweek biocontrol jaapiella ivannikovi field. Taxonomically, taxa belonging to acroptilon, leuzea, stemmacantha and rhaponticum vaill. Pdf russian knapweed rhaponticum repens is a rangeland weed pest in. The fruit is an achene with a hairy pappus traditional medicinal use. Acroptilon repens asteraceae russian knapweed, creeping knapweed. Acroptilon repens cenreoverview eppo global database. Young stems are covered with woolly hairs, which rub off in time, giving older stems a darkbrown appearance.
It is a creeping perennial that reproduces by seed and creeping, horizontal roots. Sustainable invasive weed management must address treatment effects on desired vegetation. The plant is characterized by its extensive root system, low seed production, and persistence. Russian knapweed acroptilon repens control with low. Acroptilon repens is a perennial herbaceous plant of the aster sunflower family. Repeated tillage to 1 ft deep over a period of about 3 years can kill much of the root system. Acroptilon repens, a dicot, is a perennial herb that is not native to california. Pdf life cycle of puccinia acroptili on rhaponticum acroptilon.
Impact of two shootgalling biological control candidates on russian knapweed, acroptilon repens gulbakhar djamankulovaa, aloviddin khamraeva, urs scha. Unless otherwise noted the images are those of robert l. Evaluation of elemental allelopathy in acroptilon repens. Jepson manual treatment photo gallery species profile russian knapweed rhaponticum repens.
Herbicide effects on density and biomass of russian knapweed acroptilon repens and associated plant species. Ecology and management of russian knapweed acroptilon repens. This plant may be known by one or more common names in different places, and some are listed above. Our aim was to describe the population density of a. Allelopathic chemicals can stay in the soil after acroptilon repens has been removed. Impact of two shootgalling biological control candidates.
Invasive russian knapweed acroptilon repens creates large. Written findings of the washington state noxious weed control board may 1995 scientific name. Reliable information about the coronavirus covid19 is available from the world health organization current situation, international travel. We hope, by providing this abstract free of charge, to encourage users to contribute their. Within new mexico it can readily invade pastures, degraded croplands, alfalfa fields, rangeland, roadsides, riparian areas, and irrigation ditches. The roots of acroptilon repens can extend more than 7 meters below the soil surface with 22.
Evaluation of elemental allelopathy in acroptilon repens l. General information about acroptilon repens cenre eppo global database. Adventitious buds on lateral roots produce erect stems that are thin, openly branched, and 0. How to get this dissertations electronic documents. Media in category rhaponticum repens the following 18 files are in this category, out of 18 total. Areas free of russian knapweed should be monitored annually and all plants found should be destroyed. New shoots arise from buds on the roots, as well as on root fragments spread by cultivation. Studies on chemical constituents of acroptilon repens request pdf. Acroptilon repens hereafter acroptilon is native to turkey, central asia and china where it can. Life cycle of puccinia acroptili on rhaponticum acroptilon repens.
In 2000, it was therefore removed from the eppo alert list. The use of biological control agents is an integral part of the blms integrated weed management iwm strategy and partnership with. The patch experiment was conducted in 15 undisturbed meadows in 2003. The scientific name of russian knapweed is acroptilon repens l. Russian knapweed is a perennial forb native to eurasia, which has been designated as a noxious weed throughout. The weed was first introduced into north america in 1898 and by 1998 had spread to 3 counties in 45 of the 48 contiguous states in the united states zimmerman and kazmer, 1999. Acroptilon article about acroptilon by the free dictionary.
Impact of acroptilon repens on cooccurring native plants. Large image for acroptilon repens hardheads usda plants. Managing russian knapweed acroptilon repens june 04, 2019 celestine duncan. Abstracttwo new guaianolides have been isolated from the aerial parts of acroptilon repens. Managing russian knapweed acroptilon repens techline. Two guaianolides were isolated, chlorohyssopifolin c 1 l and repin 2 2. Acroptilon repens is a widely distributed taxon, and a noxious weed, possibly best. Cultural livestock usually avoid grazing russian knapweed because of its bitter taste. Invasive russian knapweed acroptilon repens creates large patches almost. Using a combination of adventitious shoots and allelopathic chemicals, this species. Russian knapweed acroptilon repens new mexico state university weedfactsheet 110605 mark j. The blossoms are pink and tubular and are gathered into small calathidia that form a branchy inflorescence. Added in 2000 deleted in 2000 reasons for deletion. Acroptilon repens has a welldeveloped root system, which functions as the major means of propagation and spreading.
Russian knapweed acroptilon repens, a classb designate noxious weed in lincoln county, washington. Russian knapweed acroptilon repens control with low rates of aminopyralid on range and pasture volume 1 issue 4 stephen f. Wyoming big sagebrush steppe with acroptilon repens sw side of roosevelt ut 20193414753. A sesquiterpene lactone from acroptilon repens, chemistry. Acroptilon repens invasive species list and scorecards. A conservation status rank is not applicable sna because the plant is an exotic nonnative in montana that is not a suitable target for conservation activities. Russian knapweed hardheads creeping knapweed taxonomy. Russian knapweed national invasive species information.
It is very difficult to control or eradicate once it becomes established. Dispose of aquarium plants away from natural waterways. Russian knapweed shoots emerge early in the spring and form a rosette. Acroptilon repens is a perennial herb up to 1 m tall, with creeping rhizomes and an extensive and longlived network of roots. Impact of acroptilon repens on cooccurring native plants is greater in the invaders nonnative range. A weed report from the book weed control in natural areas in the western united states russian knapweed 2 of 3 20 fragments. The stems and leaves are covered with short gray hairs.
The rosette leaves are oblanceolate, pinnately lobed to entire, 23 cm wide by 38 cm long. Numerous and frequentlyupdated resource results are available from this search. Oclcs webjunction has pulled together information and resources to assist library staff as they consider how to handle coronavirus. Rhaponticum repens, synonym acroptilon repens, with the common name russian knapweed, is a bushy rhizomatous perennial, up to 8 dm tall. Springer nature is making sarscov2 and covid19 research free. Acroptilon repens is a serious weed pest, especially in the western united states. Plants free of insects were inoculated with teliospores of selected isolates. Phytotoxic polyacetylenes from roots of russian knapweed acroptilon repens l. United states field release of aulacidea department of. A sesquiterpene lactone from acroptilon repens a sesquiterpene lactone from acroptilon repens serkerov, s aleskerova, a.
A large image of acroptilon repens hardheads from the usda plants database. Rhaponticum species are perennial herbaceous plants with simple, rarely branched stems. Ecology and management of russian knapweed acroptilon repens l. Gleason, ha, cronquist, a 1963 manual of vascular plants of northeastern. It reproduces vigorously from seed and spreads from.
Limit soil disturbances and revegetate disturbed ground with desirable species. The treatment of i with acetic anhydride in pyridine gave. Mini data sheet on acroptilon repens eppo global database. This plant and synonyms italicized and indented above can be weedy or invasive according to the authoritative sources noted below. Acroptilon repens is a plant native to eurasia and introduced worldwide fna 2006. Russian knapweed acroptilon repens new mexico state university weed factsheet 110605 mark j. Russian knapweed article pdf available in plant and soil 28912 november 2006 with 94 reads. Russian knapweed inhabits agricultural land and other disturbed places.
The rosette leaves are oblanceolate, pinnately lobed to. The roots are brown to black with a scaly appearance. Contain animals that have fed on weedinfested forage for at least 3 days to allow passthrough of weed seeds. Acroptilon repens profile california invasive plant council. Rhaponticum repens, synonym acroptilon repens, with the common name russian knapweed. Herbicide effects on density and biomass of russian. Russian knapweed is common throughout western united states. Except for the wettest areas of the northwest and driest regions of the great basin and deserts, it is found throughout california to about 6200 feet 1900 m. Russian knapweed is a member of the aster family introduced from europe. Herbicide effects on density and biomass of russian knapweed acroptilon repens and associated plant species1 stephen m. Stems and leaves are finely arachnoidtomentose becoming glabrous and green with age. Russian knapweed is a deeprooted, herbaceous perennial that spreads by seed and vegetative root buds.
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