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Topic: Diffuse knapweed

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	CWMA Diffuse knapweed
		Diffuse knapweed is not common on cultivated lands or irrigated pasture because it cannot tolerate cultivation or excessive moisture (Watson and Renney 1974).
		Diffuse knapweed is now common in the Front Range counties, and has been reported in scattered infestations from both the east and west slope of Colorado.
		Diffuse knapweed plants that have not finished the juvenile stage by the end of fall remain as rosettes through the second year and bolt during the third year.
	www.cwma.org /nx_plants/diff.htm (772 words)

	Know Your Knapweeds
		Diffuse knapweed is generally a short-lived perennial or biennial in North Dakota and invades habitats similar to spotted knapweed.
		Diffuse knapweed was found in one North Dakota county in 1996 and infested approximately 20 acres.
		Spotted and diffuse knapweed confined to small, well-defined areas should be pulled by hand or treated with a herbicide as soon as detected to avoid spread of the weed.
	www.ag.ndsu.edu /pubs/plantsci/weeds/w1146w.htm (2328 words)

	Information about diffuse knapweed - Centaurea diffusa
		Diffuse knapweed has been found in a wide range of habitats in Washington, as well, including sandy river shores, gravel banks, cracks in rocks on cliffs and outcrops, rangelands, pastures, and hayfields on sandy loams, loams, and silt loams.
		While it is not tolerant of cultivation with annual crops, diffuse knapweed thrives in gravel pits, roadsides, railroad tracks, vacant lots, airports, trails, and heavily grazed pasture.
		The seeds are moved in shoelaces, by feeding rodents, and in contaminated hay and crop seed.
	www.nwcb.wa.gov /weed_info/Written_findings/Centaurea_diffusa.html (837 words)

	Diffuse knapweed
		Diffuse knapweed is a native of Eurasia that has been known to exist in the U.S. for at least 80 years.
		Diffuse knapweed has invaded forested areas, which may indicate it is adapting to areas with higher precipitation.
		Diffuse knapweed is an annual, biennial or short-lived perennial that can grow to a height of 3 feet, with a many-branched stem that usually has a bush appearance.
	www.fs.fed.us /r4/sawtooth/botany/weeds/diffuseknapweed.htm (248 words)

	Diffuse and Spotted Knapweed
		Diffuse knapweed is a short-lived, non creeping perennial, a biennial, or occasionally an annual that reproduces and spreads solely from seed.
		Diffuse knapweed is native to degraded noncropland (waste places) and seashores from southern Europe to north-central Ukraine.
		Diffuse knapweed will not tolerate flooding or shade and thrives in the semiarid west (generally in 9- to 16-inch precipitation zones).
	www.ext.colostate.edu /pubs/natres/03110.html (1069 words)

	Untitled1 (Site not responding. Last check: 2007-10-02)
		Diffuse knapweed is a tap-rooted annual, biennial or short-lived perennial forb that reproduces by seed.
		Diffuse knapweed grows in the eastern Mediterranean area, in western Asia and from the southern part of former USSR to western Germany.
		Squarrose knapweed is closely related to spotted knapweed, so many of the insects released against spotted and diffuse knapweed have been successfully established on squarrose knapweed in states where the plant is common (California, Oregon and Utah).
	www.montana.edu /publications/knapweed/circ311.html (5122 words)

	Diffuse Knapweed Control in Feral Babysbreath
		Diffuse knapweed aggressively invades bitterbrush and sagebrush grass rangelands, reducing forage yields for livestock and wildlife.
		Diffuse knapweed is a taprooted biennial that reproduces by seed.
		Diffuse knapweed rosettes lie close to the ground, limiting their availability to cattle, but not necessarily to sheep and deer.
	cru.cahe.wsu.edu /CEPublications/eb1793/eb1793.html (1341 words)

	Diffuse Knapweed
		Diffuse knapweed is a member of the Aster family, Thistle tribe.
		Diffuse knapweed was introduced from Europe and is a biennial or short-lived perennial forb which reproduces only by seed.
		Diffuse knapweed can be found in pastures, riparian areas, roadsides, and waste areas in Colorado.
	www.co.larimer.co.us /weeds/30weeds/diffuse.htm (245 words)

	Backyard Gardener - Diffuse Knapweed, May 5, 2004
		Diffuse knapweed (Centaurea diffusa) is one species that I have not written about previously.
		Diffuse knapweed can be a short-lived perennial, a biennial, or occasionally an annual and reproduces and spreads from seed.
		Diffuse knapweed is also known as tumble knapweed because it will often snap off at ground level after it dries out.
	ag.arizona.edu /yavapai/anr/hort/byg/archive/diffuseknapweed.html (666 words)

	Getting to Know Knapweeds - Biology and Biological Control of Knapweed
		Knapweeds are distinguished by their bract shape, flower color, leaf shape, roots, seeds and branching habit.
		Habitat and Occurrence: Diffuse knapweed is wide-ranging, although it prefers habitats in the shrub-steppe zones and dry forest habitats.
		The bracts of brown knapweed are light to dark brown, with a papery, translucent margin.
	www.invasive.org /weeds/knapweed/chapter1.html (1882 words)

	CWMA Spotted knapweed
		Although spotted knapweed is usually found in disturbed areas, once a plant colony is established, it may invade adjacent areas that are relatively undisturbed or in good condition (Rutledge and McLendon, 1998).
		Spotted knapweed infestations are not as severe in Colorado as diffuse knapweed (Beck 1997).
		Sheley and Jacobs (1997) found that a ninety percent reduction in diffuse knapweed was necessary to shift the competitive relationship in favor of bluebunch wheatgrass.
	www.cwma.org /nx_plants/spot2.htm (979 words)

	Knapweed Home
		Diffuse and Spotted Knapweed are both pioneer species which readily establish themselves on dry, disturbed soils, such as roadsides.
		Knapweed seed is spread when the mature plants break off at the root stock and are blown by the wind, or are caught and dragged by vehicles.
		Knapweed plants have a very bitter taste and infested rangeland are generally not grazed by cattle or wildlife.
	www.neweed.org /noxweeds/knap.htm (455 words)

	[No title]
		I was first introduced to diffuse knapweed by my father, who had lots of it on his cattle ranch in the Chiliwist Valley.
		The alternative that evolution designed knapweed with the automobile in mind is somewhat hard to accept, however it might be noted that the home range of diffuse knapweed coincides well with the cradle of civilization in Eurasia.
		Knapweed burns both hot and fast, and the margin between an out-of-control brush fire and a fire that won’t even stay lit can be due to just a change in humidity.
	www.okanogan1.com /natural/ecology/weeds/knapweed_chronicles.htm (6831 words)

	Spotted and Diffuse Knapweed Biological Control Plan
		Diffuse and spotted knapweed are serious weeds of pasture and rangeland in western America.
		Diffuse knapweed is a biennial or triennial with an elongated root tap, erect stems 50 to 80 cm in height and white flowers, occasionally pink to purple.
		Spotted knapweed is a biennial or short-lived perennial, 30 to 100 cm in height with purple flowers, rarely white.
	www.ag.state.co.us /csd/insectary/knapweed.html (1647 words)

	Knapweed - Its cost to British Columbia
		Knapweed infestations are causing major environmental deterioration and loss of beef production in the southern interior of British Columbia.
		Knapweed is highly competitive, capable of invading grassland sites to the exclusion of native vegetation.
		Knapweeds are easily controlled on rangeland, permanent grass pasture and non-cropland with low rates of selective herbicides.
	www.agf.gov.bc.ca /cropprot/knapweed.htm (889 words)

	Noxious Weed IVM Guide - Knapweed
		Diffuse knapweed is normally a biennial or short-lived perennial with long, fibrous taproots.
		Knapweeds flower from July to October and bolt in early May. A mature spotted knapweed plant can produce up to 25,000 seeds that are dispersed by infested hay, wind, water, vehicles and equipment, animals, or shoes.
		Diffuse knapweed seed production can be reduced when grazed during the bolting stage for 10 days, and again after 14 days for an addition 10 days.
	www.efn.org /~ipmpa/Noxknapw.html (6546 words)

	Diffuse Knapweed
		Diffuse knapweed is distinct from the other knapweeds in that it has spiney bracts on the seed head that will actually prick your finger.
		Diffuse knapweed spreads its seed by lodging when mature and tumbling in the wind across the land.
		It is an aggressive weed that is alleopathic and poisonous to horses.
	www.co.larimer.co.us /depts/pubwor/weeds/diffuse.htm (123 words)

	Larinus minutus
		When the adults first emerge from the knapweed seedhead they are light grey with some yellow fuzz on their bodies.
		Spotted and diffuse knapweed are weed species that can be found throughout the northern tier of states and as far south as Nebraska and Virginia.
		This weevil along with other seed feeders will further reduce the seed that spotted and diffuse knapweed are dependent on for reproduction, dispersal, and survival.
	www.nysaes.cornell.edu /ent/biocontrol/weedfeeders/larinus_minutus.html (664 words)

	Centaurea diffusa (Diffuse Knapweed) - Biology (Site not responding. Last check: 2007-10-02)
		Juvenile: As a juvenile diffuse knapweed is a rosette with hairy finely divided basal leaves.
		The stems are hairy and rough to the touch, and diffusely branched.
		Biology: Diffuse knapweed is a biennial or short lived perennial plant, which reproduces exclusively by seed, and has a tap root.
	cropandsoil.oregonstate.edu /weeds/Diffuse_knapweed/biology.html (155 words)

	Diffuse knapweed - Wikipedia, the free encyclopedia
		Effective control of diffuse knapweed requires a fusion of well-executed land management, biological control, physical control, chemical control and reestablishment of the native species.
		Another aspect of diffuse knapweed’s success relies on the effect of its allelopathic chemicals in its novel environment.
		The high number of seeds produced by diffuse knapweed is also a common trait of invasive plants.
	en.wikipedia.org /wiki/Diffuse_knapweed (2368 words)

	Canada Thistle (Site not responding. Last check: 2007-10-02)
		Diffuse knapweed is an annual, biennial or short-lived perennial introduced from Eurasia.
		The seedlings of diffuse knapweed have finely divided leaves with small hairs.
		The fruits are brown or grayish and the plant is tap-rooted.
	agr.state.mt.us /weedpest/Category1/DiffuseKnapweed.htm (134 words)

	Diffuse Knapweed
		Diffuse knapweed has hairy, greyish-green, split leaves on many branches growing from a single upright stem.
		Diffuse knapweed has a taproot and grows to 1 metre in height.
		In British Columbia diffuse knapweed is found on grasslands, shrub lands, and dry open forests at low- to mid-elevations, but rarely on cultivated lands or irrigated pasture because it cannot tolerate cultivation or excessive moisture.
	www.weedsbc.ca /weed_desc/diffuse.html (197 words)

	Diffuse Knapweed Identification - King County Noxious Weed Control Program
		Diffuse knapweed is a biennial or weak perennial
		As a Class B noxious weed, diffuse knapweed control is required in King County.
		For information on controlling diffuse knapweed in King County, please read the knapweed best management practices (56 KB Acrobat file, 9 seconds on 56K modem) and informational Selected Knapweeds of Washington (316 KB Acrobat file, 46 seconds on 56K modem).
	dnr.metrokc.gov /wlr/lands/weeds/diffknap.htm (333 words)

	ODA Plant Division, Noxious Weed Control Diffuse knapweed
		Diffuse knapweed will form dense stands on any open ground, excluding more desirable forage species.
		Diffuse is a member of a large genus of over 400 species, most originating in the Mediterranean region.
		Diffuse knapweed was first introduced to the Pacific Northwest at the turn of the century as a contaminant in alfalfa seed imported from Turkestan, Turkmenistan or hybrid alfalfa seed from Germany.
	www.oregon.gov /ODA/PLANT/WEEDS/profile_diffuseknapweed.shtml (190 words)

	Jackson Hole Weed Management Association
		Diffuse knapweed was introduced from the Mediterranean Region of Eurasia and is a biennial or short-lived perennial forb which reproduces only by seed.
		Diffuse knapweed can resemble spotted knapweed, which has fl-tipped bracts.
		Diffuse knapweed can be found in pastures, riparian areas, roadsides, and waste areas.
	www.jhwma.org /diffuse.html (241 words)

	Identification and Control of Knapweed Species in Central and Eastern Oregon, EC 1559
		Knapweed species can be toxic to the skin for some individuals, so be sure to wear gloves when pulling them.
		Spotted knapweed, diffuse knapweed, and yellow starthistle can be mowed repeatedly depending on the time of year and plant growth stage.
		For example, some knapweed species are more susceptible to certain herbicides as a young plant in the rosette stage (Figures 1, 3, 5, and 7) than they are in the flowering stage.
	extension.oregonstate.edu /catalog/html/ec/ec1559 (1379 words)

	Centaurea genus part 1 (Site not responding. Last check: 2007-10-02)
		Spotted and diffuse knapweed seeds exhibit 3 germination patterns: non-dormant seeds that germinate with or without light exposure, dormant seeds that germinate in response to red light, and dormant seeds that are not light sensitive.
		For diffuse knapweed, wind dispersal occurs by a "tumbleweed effect" and seed may be released over long distances.
		The severity of knapweed infestations in other states such as Montana and Wyoming should serve as an indicator of the potential economic and environmental problems that knapweeds pose to California.
	www.cdfa.ca.gov /phpps/ipc/weedinfo/centaurea.htm (3101 words)

	Diffuse Knapweed
		This weed is a diffusely branched annual or short-lived perennial, 1 to 2' tall, stems are rough to the touch.
		Margins of the bracts are divided like the teeth of a comb, and bracts are tipped with a definite slender spine.
		Diffuse knapweed infests roadsides, waste areas and dry rangelands, and as a highly competitive plant, threatens to exclude may desirable species.
	www.kiowacd.org /Tips_Links/diffuse_knapweed.htm (90 words)

	Gem County Weed Department--Diffuse Knapweed
		BACKGROUND: Diffuse knapweed is a native of Eurasia, coming to the U.S. in the early 1900s.
		DESCRIPTION: Diffuse knapweed is an annual, biennial, or short-lived perennial that can grow to a height of 3 feet, with a single, much-branched stem that gives the plant a bushy appearance.
		DISTRIBUTION: Diffuse knapweed is widespread in the Northwest and in many other states.
	www.co.gem.id.us /weed/noxious/diffuse_knapweed.htm (248 words)

	Diffuse Knapweed Management
		Additional herbicide treatments after grass establishment may be needed to keep diffuse knapweed populations reduced to an acceptable level.
		Mowing (or other mechanical efforts) diffuse knapweed when it is in the bud stage, and again when it flowers, will significantly reduce seed production.
		Diffuse knapweed can be easy to pull by hand.
	www.colostate.edu /Depts/CoopExt/Adams/weed/dknapweed_mgt.htm (452 words)

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