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2 edition of Identification and control of knapweed species in central and eastern Oregon found in the catalog.

Identification and control of knapweed species in central and eastern Oregon

Amy Jo Waldo

Identification and control of knapweed species in central and eastern Oregon

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  • 21 Currently reading

Published by Oregon State University Extension Service in [Corvallis, Or.] .
Written in English

    Subjects:
  • Knapweeds -- Control -- Oregon.,
  • Knapweeds -- Identification -- Oregon.

  • Edition Notes

    StatementAmy Jo Waldo.
    SeriesEC / Oregon State University Extension Service -- 1559., Extension circular (Oregon State University. Extension Service) -- 1559.
    ContributionsOregon State University. Extension Service.
    The Physical Object
    Pagination[4] p. :
    ID Numbers
    Open LibraryOL17722829M


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Identification and control of knapweed species in central and eastern Oregon by Amy Jo Waldo Download PDF EPUB FB2

Identification and Control of Knapweed Species in Central and Eastern Oregon Amy Jo Waldo, area Extension horticulture agent, Oregon State University.

Amy Jo Waldo Four species of Centaurea are commonly found in central and eastern Oregon, including spot-ted knapweed (Centaurea maculosa), diffuse knapweed (Centaurea diffusa), Russian.

Identification and control of knapweed species in central and eastern Oregon book and Control of Knapweed Species in Central and Eastern Oregon. Identification and Control of Knapweed Species in Central and Eastern Oregon.

Oregon Noxious Weed Policy and Classification () 'A', 'B,' and 'T,' listed weeds for the state of Oregon. The State Noxious Weed List is used to prioritize activities at the state level and provide direction in the development of county weed lists that guide local control programs.

What is the species. Centaurea diffusa and C. maculosum (diffuse and spotted knapweeds) ODA “B” rank; Although spotted and diffuse knapweeds prefer the drier conditions found in eastern Oregon, several populations exist in Portland’s transit corridors.

Spotted Knapweed Identification and Management Background Information History and Impacts Spotted knapweed (Centaurea stoebe synonyms C.

biebersteinii and C. maculosa) is native to Central, Eastern and Southeastern Europe. Before it was considered to be a serious weed, it was spread in domestic hay and by human Size: KB.

knapweed appears more Christmas-tree like, especially in dense stands (b). Identification Figure 3. Distinguishing the knapweed species by rosette alone is difficult. Spotted knapweed rosette leaves may be nearly entire (a) to deeply divided with relatively wide lobes (b and c), whereas diffuse knapweed tends to have more finely divided lobes.

biological control of six species of knapweeds: 1) spotted knapweed, 2) diffuse knap-weed, 3) squarrose knapweed, 4) meadow knapweed, 5) black knapweed, and 6) brown knapweed.

Spotted knapweed, Centaurea stoebe, is perhaps the most wide-spread species, followed in abundance by diffuse knapweed, C.

diffusa. A third. Executive Office Montana Weed Control Association, Inc. PO BoxTwin Bridges, MT () | () (fax). Brown knapweed is a Class B Noxious Weed in Washington, first listed before It is designated for required control by the Washington State Noxious Weed Control Board and is on the list of Regulated Class B Noxious Weeds in King County.

Spotted knapweed, a class-B non-designate noxious weed in Lincoln County, Washington (Centaurea biebersteinii) is of the Asteraceae family. Spotted knapweed is a native of central Europe and has also been called bachelor’s button.

In past times, young women wore spotted knapweed flowers to attract bachelors. Spotted knapweed is a short-lived. Centaurea (/ ˌ s ɛ n t ɔː ˈ r iː ə /) is a genus of between and species of herbaceous thistle-like flowering plants in the family s of the genus are found only north of the equator, mostly in the Eastern Hemisphere; the Middle East and surrounding regions are particularly species-rich.

In the western United States, yellow starthistles are an invasive : Tracheophytes. In the U.S. 8 flower seedhead and 5 root-boring insect species have been approved for release as bio-control on spotted knapweed. Knapweed Gall Flies (Urophora affinis, U. quadrifasciata) were released over 20 years ago in Montana and now are well-established in the western U.S.

In: Van Driesche, R., et al.,Biological Control of Invasive Plants in the Eastern United States, USDA Forest Service Publication FHTET, p. Pest Status of Weed.

Spotted knapweed, Centaurea maculosa Lamarck, is a purple-flowered, herbaceous, perennial weed, living three to five years on Identification and control of knapweed species in central and eastern Oregon book. It infests semiarid range lands in the western United. Diffuse knapweed is a non-native biennial forb that reproduces solely by seed.

A biennial is a plant that completes its life cycle within two years. During the first year of growth, Diffuse knapweed appears as a rosette in spring or fall. During the second year in mid to late spring – the stem bolts, flowers, sets seed, and the plant dies.

Weeds in Pastures and Hayground Collection Here is a collection of our favorite resources for weeds in pastures and hayground. Foxtail Control in Pastures and Hayground Identification and Control of Knapweed Species in Central and Eastern Oregon This publication describes potential hazards, management, and identification of knapweeds.

Knocking Out Knapweed. Another July has come and gone, but not all of the fireworks are over. The striking pink display of spotted knapweed, Centaurea stoebe ssp. micranthos, is still going strong in rangelands and old fields and along highways and railroad grades across the country.

Native to Europe, spotted knapweed was introduced. A single square foot of spotted knapweed can produce 5, seeds, which can remain viable for eight years or more. As spotted knapweed seeds mature in late summer and fall, they can be spread on mowing equipment and in infested hay, seed, and gravel, or by hitchhiking on vehicles, other equipment, and even clothing.

Russian knapweed out-competes crops, degrades rangeland, and causes reduced biomass of native vegetation, negatively affecting the ecology of our wildlands. In many instances, Russian knapweed is so widespread on low-value land that the use of herbicides is uneconomical and detrimental to the environment.

Biological Control of Russian Knapweed. Biological: There are currently 13 biological control agents. Successful treatment requires one seed head and one root mining agent.

Contact the Wisconsin Department of Agriculture, Trade and Consumer Protection. For more information on control techniques, visit the Spotted knapweed factsheet [exit DNR] by University of Wisconsin-Extension. Meadow knapweed (Centaurea moncktonii) is a hybrid between two European knapweed species: black knapweed (Centaurea nigra), which is native to the British Isles and brown knapweed (Centaurea jacea) which is native to continental parent species are sold as flower seeds in the United States and Europe.

Whether meadow knapweed was. However both species of weevils feed readily on both species of knapweed. Larval feeding in the seedhead destroys the knapweed seed before it matures. One larva can consume % of the seed in a single seedhead. When combined with the widespread knapweed seedhead flies, the seedhead weevil can reduce knapweed seed production by 95%.

Spotted knapweed is in the Asteraceae (sunflower) family. In its native range of Western, Central, and Eastern Europe, two sub-species have been identified; Centaurea stoebe. spp. stoebe. is diploid and biennial, and subspecies. stoebe. spp. micranthos.

is tetraploid and perennial. The perennial subspecies isFile Size: KB. In areas where desirable species are absent, long-term control of spotted knapweed is unlikely (Sheley et al. Establishing competitive desirable plants is essential for successfully managing spotted knapweed.

Spotted knapweed is a tap-rooted plant that can be controlled with cultivation to a depth of 7 inches, or hand removal. Persistent. USDA FS-Common Control Measures for Invasive Plants of the Pacific Northwest Region (CESTM) USDA NAL-National Invasive Information Center (CESTM) USDA NRCS Plant Materials (CEBI2) USDA NRCS-Montana Invasive Species Technical Notes (CESTM) VA-Invasive Alien Plant Species of Virginia (CESTM) VA-Virginia Tech Weed Identification Guide.

Another approach is to control the knapweed with natural predators. Jim Story, an entomologist at Montana State University, has gone to Central and Eastern Europe in Author: Joe Alper. Spotted Knapweed Genus: Centaurea Species: biebersteinii (Centaurea stoebe Lamarck ssp.

micranthos (Gugler) Hayek syn. biebersteinii, formally C. maculosa) Click Image DESCRIPTION: Spotted knapweed is a short-lived perennial forb of the Asteraceae family. It commonly grows to feet in height. Common knapweed, also known as 'Black knapweed', is a thistle-like plant that can be found on all kinds of grasslands, from roadside verges to woodland rides, clifftops to lawns.

It is in bloom from June to September and is a huge favourite of all kinds of butterflies, including Common blues, Marbled whites and Meadow browns, and is sometimes.

This is part of a series of videos providing key characteristics for the identification of invasive plants listed in Wisconsin's invasive species administrative rule NR Agapeta zoegana, or the sulfur knapweed moth, is a biological control agent that attacks knapweed plants by tunneling into the cortex of the root.

Adults are inches long and usually emerge over a week period from mid-June to early. Knapweed is a dull green plant entirely covered with small, rough hairs. Upright stems are branched at the top and the stems are ribbed, and sometimes as they age they become hairless.

Knapweed reproduces by seed and can regenerate from. Centaurea nigra - Common Knapweed. Phylum: Magnoliophyta - Class: Equisetopsida - Order: Asterales - Family: Asteraceae Equally well known as Black Knapweed, notably in the English Midlands these thistle-like wildflowers are also referred to as Hardheads, because the buds and flower heads are firm and solid.

Greater knapweed is a thistle-like plant that can be found on chalk downlands, roadside verges, woodland rides, hedgerows and clifftops.

It is more restricted in its distribution than its close relative, Common knapweed, being found mainly in England on chalky soils.

Overall, invasive species are the second largest threat to Missouri’s native plants and animals behind habitat destruction.

However, they can be the primary threat in local instances. One of Missouri’s worst invaders is spotted knapweed (Centaurea stoebe micranthos), a plant species native to Europe and western Asia. Spotted knapweed has. Invasive plant.

It has been introduced to North America, where it is considered an invasive plant species in much of the western United States and Canada. InC. maculosa occupied more than 7 million acres (28, km 2) in the US. Knapweed is a pioneer species found in recently disturbed sites or openings.

Once it has been established at a disturbed site, it continues to Family: Asteraceae. A WEED REPORT from the book Weed Control in Natural Areas in the Western United States Russian knapweed 2 of 3 fragments. Repeated tillage to 1 ft deep over a period of about 3 years can kill much of the root system.

Cultural Livestock usually avoid grazing Russian knapweed because of its bitter taste. Russian knapweed is toxic to. Delaware Invasive Species Council: Hoffman, R. & K. Kearns, Eds. Wisconsin manual of control recommendations for ecologically invasive plants.

Wisconsin Dept. Natural Resources, Bureau of Endangered Resources. Madison, Wisconsin. Jil M. Swearingen, Survey of invasive plants occurring on National Park Service lands, Summary of Invasiveness Top of page. repens is a deep rooted perennial that is native to Eurasia.

It was accidentally introduced into North America as a contaminant of seed and spread rapidly. repens can be a serious crop pest in its native range and forms large monotypic stands that reduce diversity and degrade forage quality on rangelands.

Cariboo-Central. Both species also occur in coastal and northern areas of the province and in the Yukon. Native to Mongolia, western Turkestan, Iran, Turkish Armenia, and Asia Minor, Russian knapweed is another highly competitive knapweed variety.

Similar to diffuse and spotted knapweed, Russian knapweed was first introduced into Canada around File Size: 76KB. Original Distribution: Central Europe Current Distribution: USDA PLANTS Database lists C.

maculosa in all states except for Texas, Oklahoma, Mississippi, Georgia, and Alaska. Site and Date of Introduction: Spotted knapweed's arrival in North America is estimated in the early s. The earliest collection of spotted knapweed is from Victoria, British Columbia in Knapweed mapping and treatment in western Siskiyou County.

In order to prevent the spread of knapweed species downstream, where agricultural lands could be impacted, or upslope to forests and rangeland, Siskiyou WMA treated populations. Buy Plants of Western Oregon, up-to-date, and well-illustrated book for the identification of plants of the Pacific Northwest.

This is the definitive guide to the rich and varied plant life of the region, from the ocean shore to the crest of the Cascades, from British Columbia south through the Klamath Mountains of southwestern Oregon and /5(16).Additionally the Invasive Species in Oregon Report Card for is useful reading.

Oregon Department of Agriculture Insect Pest Prevention and Management Section Oregon Noxious Weed Control Program Included with lots of other useful .Celebrating Wildflowers provides a variety of colorful and interesting articles, photos, posters, interpretive panels, and activities about wildflowers, pollinators, our native plants, and links to other sources of this information.