Trichosirocalus horridus

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Trichosirocalus horridus
Trichosirocalus horridus dorsal.jpg
Trichosirocalus horridus lateral.jpg
Scientific classification
Kingdom: Animalia
Phylum: Arthropoda
Class: Insecta
Order: Coleoptera
Family: Curculionidae
Subfamily: Baridinae
Tribe: Ceutorhynchini
Genus: Trichosirocalus
Species: T. horridus
Binomial name
Trichosirocalus horridus
(Panzer, 1801) [1]

Trichosirocalus horridus is a species of true weevils, 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.[2][3]

Life history[edit]

T. horridus feeds on the rosettes of thistles, with the larvae causing most damage to the plant.

Nontarget impacts[edit]

In 2004, T. horridus was observed feeding on the native thistle Cirsium altissimum L. in Nebraska.[4] The weevil was observed on the native thistle at about the same rate as the targeted invasive thistle (Cirsium vulgare).[4] T. horridus has also been observed feeding on 5 native Cirsium species in Tennessee.[5]


  1. ^ "Trichosirocalus horridus". Integrated Taxonomic Information System. 
  2. ^ 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.
  3. ^ 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.
  4. ^ a b Masaru Takahashi, Svata M. Louda, Tom E. X. Miller and Charles W. O’Briens. "Occurrence of Trichosirocalus horridus (Coleoptera: Curculionidae) on Native Cirsium altissimum Versus Exotic C. vulgare in North American Tallgrass Prairie" (PDF). Environ. Entomol. 38(3): 731-740 (2009). 
  5. ^ Gregory J. Wiggins; Jerome F. Grant; Paris L. Lambdin; Jack W. Ranney; John B. Wilkerson. "First documentation of adult Trichosirocalus horridus on several non-target native Cirsium species in Tennessee". Biocontrol Science and Technology, Volume 19, Issue 9 October 2009 , pages 993 - 998. 
  • Coombs, E. M., et al., Eds. (2004). Biological Control of Invasive Plants in the United States. Corvallis: Oregon State University Press, 365.