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Trichosirocalus horridus : ウィキペディア英語版 | Trichosirocalus horridus
''Trichosirocalus horridus'' is a species of true weevil, native to Europe. It is a biological pest control agent that was introduced into the United States in 1974 to control exotic thistles, especially in the ''Cirsium'' and ''Carduus'' genera.〔Ward, R. H., R. L. Pienkowski, and L. T. Kok. 1974. Host speciÞcity of first-instar ''Ceuthorhynchidius horridus'', a weevil for biological control of thistles. J. Econ. Entomol. 67: 735-737.〕〔Kok, L. T. 1975. Host speciÞcity studies on ''Ceuthorhynchidius horridus'' (Panzer) (Coleoptera: Curculionidae) for the biocontrol of Musk and Plumeless thistles. Weed Res. 15: 21-25.〕 == Life history == ''T. horridus'' feeds on the rosettes of thistles, with the larvae causing most damage to the plant.
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