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knapweed

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knapweed
knapweed (ˈnæpwiːd) [Orig. knopweed, f. knop n.1 + weed n.; from the hard rounded involucre.] The common name of species of Centaurea (family Compositæ), esp. C. nigra, a common weed with a hard tough stem, and light purple flowers set on a hard rough dark-coloured globular ‘head’ or involucre.α 14.... Oxford English Dictionary
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Meadow knapweed
Meadow knapweed (Centaurea × gerstlaueri), also known as hybrid knapweed or protean knapweed, is a fertile hybrid between black knapweed (Centaurea nigra Black knapweed has dark, comb-like bracts, while brown knapweed has rounded, papery tips. Meadow knapweed is intermediate between the two. wikipedia.org
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Knapweed Nightmare
The knapweed detection dog was taught a little differently than normal scent detection dogs- spending at least 10 seconds digging at a rosette of knapweed Nightmare has a 93 percent success rate overall in locating the invading non-native spotted knapweed. wikipedia.org
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Bangasternus fausti
It is used as an agent of biological pest control against noxious knapweeds, particularly spotted knapweed (Centaurea maculosa), squarrose knapweed (Centaurea virgata ssp. squarrosa), and diffuse knapweed (Centaurea diffusa). wikipedia.org
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Alpine flower identification — Italy/France I have been using the internet to try to identify alpine flowers photographed in July 2007 on a shortish walk above Chianale (1800 m), in the Italian Valle Varaita (borderin...
This is not _Jasione montana_ , but _**Phyteuma orbiculare**_ , another member of the family Campanulaceae. Except for the different flowers, Jasione has no leaves on the upper part of the stem. This plant has. And these leaves are toothed and have a heart-shaped base, unlike Jasione. And finally: P...
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Centaurea jacea
Centaurea jacea, brown knapweed or brownray knapweed, is a species of herbaceous perennial plants in the genus Centaurea native to dry meadows and open Centaurea × moncktonii is a fertile hybrid between black knapweed and brown knapweed. wikipedia.org
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Centaurea
and blunt knapweed flower weevil (L. obtusus) for spotted knapweed. Centaurea nigra – common knapweed, black knapweed, lesser knapweed, hardheads Centaurea nigrescens – Tyrol knapweed, short-fringed knapweed, Tyrol thistle wikipedia.org
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Chaetorellia acrolophi
Chaetorellia acrolophi is a species of tephritid fruit fly known as the knapweed peacock fly. It is used as an agent of biological pest control against noxious knapweeds, especially spotted knapweed (Centaurea maculosa). wikipedia.org
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Centaurea diffusa
Centaurea diffusa, also known as diffuse knapweed, white knapweed or tumble knapweed, is a member of the genus Centaurea in the family Asteraceae. lesser knapweed flower weevil and the knapweed root weevil. wikipedia.org
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Urophora affinis
It has been released in the United States and Canada as a biocontrol agent to control spotted knapweed. Life history U. affinis is multivoltine and overwinters as a larva in knapweed flower heads. In June, adults oviposit on seed heads. wikipedia.org
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Centaurea stoebe
Centaurea stoebe, the spotted knapweed or panicled knapweed, is a species of Centaurea native to eastern Europe, although it has spread to North America Because cattle prefer the native bunchgrass over knapweed, overgrazing can often increase the density and range of knapweed infestations. wikipedia.org
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Centaurea nigra
Centaurea nigra is a species of flowering plant in the family Asteraceae known by the common names lesser knapweed, common knapweed and black knapweed. Centaurea ×moncktonii, is a fertile hybrid between black knapweed and brown knapweed. wikipedia.org
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Centaurea nigrescens
Centaurea nigrescens, the Tyrol knapweed, short-fringed knapweed or Tyrol thistle, is a perennial plant in the genus Centaurea that grows natively in Central wikipedia.org
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Cyphocleonus achates
Cyphocleonus achates is a species of true weevil known as the knapweed root weevil. The weevil prefers spotted knapweed, but it is sometimes found on diffuse knapweed. It has not been shown to attack native flora. wikipedia.org
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Centaurea virgata
Heads are slightly curved downward and resemble diffuse knapweed (Centaurea diffusa Lam.) on a diet but with rose-purple flowers. The taproot allows this weed to thrive in dry sites so it maybe more invasive than diffuse knapweed in ultra-dry rangeland. wikipedia.org
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