Host plant testing ofUrophora quadrifasciata [Diptera: Tephritidae] againstCarthamus tinctorius and two North American species ofCentaurea

@article{Rees1991HostPT,
  title={Host plant testing ofUrophora quadrifasciata [Diptera: Tephritidae] againstCarthamus tinctorius and two North American species ofCentaurea},
  author={Norman E. Rees and Jim M. Story},
  journal={Entomophaga},
  year={1991},
  volume={36},
  pages={115-119}
}
Host specificity ofUrophora quadrifasciata (Meig.) [Dipt.: Tephritidae], an introduced biological control agent of diffuse and spotted knapweed, was investigated by exposing flies to safflower,Carthamus tinctorius L., and 2 native knapweeds,Centaurea americana Nutt. andC. rothrockii Greenman. Results of the tests, and literature records indicate thatU. quadrifasciata is host specific to a few closely related plants of introduced knapweed species, and thus poses no threat to economically and… 
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Distribution of Urophora Affinis and U. Quadrifasciata (Diptera: Tephritidae) for biological control of spotted knapweed (Centaurea Maculosa) and diffuse knapweed (Centaurea Diffusa) in Michigan

Urophora affinis and U. quadrifasciata are two seedhead flies approved for release in the United States in 1971 and 1988 for biological control of spotted and diffuse knapweed.

Attack of Urophora Quadrifasciata (Meig.) (Diiptera: Tephritidae) A Biological Control Agent for Spotted Knapweed ( Centaurea Maculosa Lamarck) and Diffuse Knapweed ( C. Diffusa Lamarck) (Asteraceae) by a Parasitoid, Pteromalus Sp. (Hymenoptera: Pteromalidae) in Michigan

Urophora quadrifasciata_(Meig.) a seedhead fly released in North America for biological control of Centaurea maculosa and C. diffusa is parasitized by a Pteromalus sp. Parasitism up to 60% of U.…

Larinus minutus (Coleoptera: Curculionidae) and Urophora quadrifasciata (Diptera: Tephritidae), Evidence for Interaction and Impact on Spotted Knapweed in Arkansas

It is determined that L. minutus is more effective at reducing spotted knapweed seed production than U. quadrifasciata within individual capitula, and this could affect the efficacy of the biological control program.

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Two tephritid flies of European origin have been introduced into North America for biological control of spotted knapweed, Centaurea maculosa Lam., and diffuse knapweed, C. diffusa Lam. One, Urophora…

Release and Establishment of Urophora affinis (Diptera: Tephritidae) on Spotted Knapweed in Western Montana

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Diffuse knapweed (Centaurea diffusa Lam.) and spotted knapweed (C. maculosa Lam.) presently infest approximately 1.5 million ha of pasture and rangeland in Washington, Montana, Idaho, Oregon, and…

ALLELOPATHIC POTENTIAL OF DIFFUSE KNAPWEED (Centaurea diffusa) EXTRACTS

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Chromatographic techniques were developed to isolate an inhibitor common to the three species which was soluble in both water and ether, and inhibitory to the seedling development of barley and lettuce and relatively more inhibitive to root development than to the top growth of the species tested.

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