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

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Abstract

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 ecologically important plant species in the United States.

Résumé

Les tests de spécificité d'hôtes ont été effectués en exposant 3 espèces de plantes (Carthamus tinctorius L., et deux espèces indigènes,Centaurea americana Nutt. etC. rothrockii Greenman) àUrophora quadrifasciata (Meig.), agent introduit de lutte biologique contre les centaurées “diffuse” et “spotted”. Les résultats des tests, en accord avec la littérature existante, indiquent qu'U. quadrifasciata a une spécificité réduite à quelques plantes hôtes très proches des espèces de centaurées introduites. De ce fait, il n'y a aucune menace concernant les espèces de plantes américaines ayant une importance économique et écologique.

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Author notes

  1. N. E. Rees (Research Entomologist)

    Present address: Rangeland Weeds Laboratory, Agric. Res. Serv., U.S. Dept. Agric., 59717, Bozeman, MT

  2. J. M. Story (Senior Research Entomologist)

    Present address: Western Agric. Res. Ctr., 59828, Corvallis, MT

Authors and Affiliations

  1. Agriculture Research Service Biological Control of Weeds Research Unit, U.S. Department of Agriculture, USA

    N. E. Rees (Research Entomologist) & J. M. Story (Senior Research Entomologist)

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  1. N. E. Rees
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  2. J. M. Story
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Rees, N.E., Story, J.M. Host plant testing ofUrophora quadrifasciata [Diptera: Tephritidae] againstCarthamus tinctorius and two North American species ofCentaurea . Entomophaga 36, 115–119 (1991). https://doi.org/10.1007/BF02374642

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  • DOI: https://doi.org/10.1007/BF02374642

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