Host plant testing ofUrophora quadrifasciata [Diptera: Tephritidae] againstCarthamus tinctorius and two North American species ofCentaurea |
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| Authors: | N E Rees J M Story |
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| Institution: | (1) Agriculture Research Service Biological Control of Weeds Research Unit, U.S. Department of Agriculture, USA;(2) Present address: Rangeland Weeds Laboratory, Agric. Res. Serv., U.S. Dept. Agric., 59717 Bozeman, MT;(3) Present address: Western Agric. Res. Ctr., 59828 Corvallis, MT |
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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.
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| Keywords: | Biological control diffuse knapweed spotted knapweed |
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