The female lays over 100 eggs on or near the bracts of the thistle flower head. http://data.gbif.org, Goeden RD, 1995. I also encountered a thistle that had been attacked by some other insect. Native to Europe and western Asia, R. conicus has been deliberately introduced to Canada in 1968 (Harris and Zwölfer, 1971; Generate a print friendly version containing only the sections you need. by Kelleher JS, Hulme MA]. R. conicus has eight synonyms (Hoffmann, 1956; Alonso-Zarazaga and Talamelli, 2011). This weevil only has a partial second generation in more temperate climates (Gassmann and Kok, 2002); however, in Tennessee and Georgia, R. conicus was observed to complete one generation and then not feed on thistles until the following spring (Wiggins, 2013, personal communication). Population growth of Rhinocyllus conicus (Coleoptera: Curculionidae) on two species of native thistles in Prairie. Oikos, 121(1):85-94. http://onlinelibrary.wiley.com/journal/10.1111/(ISSN)1600-0706, Russell FL, Louda SM, Rand TA, Kachman SD, 2007. by Delfosse, E. S. \Scott, R. R.]. Thistle-head weevil (Rhinocyllus conicus); adult. USA: United States Department of Agriculture-Natural Resources Conservation Office. These differences relate to the different ecotypes by both region and host, and allow this species to persist under a broader range of hosts and climates. Establishment of an introduced weevil Rhinocyllus (Col., Curculionidae) for the biological control of nodding thistle Carduus nutans (Compositae) in Southern Ontario. thistles in North America suggests at least 8 lessons for future biological control efforts. Carduus nutans (nodding thistle). It was introduced to control the alien and invasive Nodding/Musk/Russian thistle (Carduus nutans) and a few of its relatives, and now it’s at home in pastures and grasslands and road edges over much of North America. Pitcher's thistle (Cirsium pitcheri). 45 (4), 534-537. As the impacts of R. conicus on some of them has been quite significant (Louda et al., 1990; 1995; Louda and Potvin, 1995; Louda 1998), and as some of these native thistles were already threatened,  R. conicus is now considered an invasive species within parts of North America (Louda et al., 1997). (Col., Curculionidae), a successful agent for biocontrol of the thistle, Carduus nutans L. Zeitschrift für Angewandte Entomologie. In: Schenkling S, ed. Maw (1982) also found eggs on the native C. flodmanii (Rydb.) of coldest month > 0°C and < 18°C, mean warmest month > 10°C, Cf - Warm temperate climate, wet all year, Warm average temp. NTRBs overwinter as adults and emerge early in the following summer to lay eggs and then die. (Remember – native thistles support a large and complex community of animals, from cohabitants of the thistle bud, to Goldfinches and small mammals that use the fluff for nests, to butterflies and native bees that eat pollen and nectar from the flowers, to bee keepers who bottle thistle honey, to herbalists who harvest thistles for their medicinal value.). CABI is a registered EU trademark. Apply herbicides such as Tordon, Milestone, Transline, Perspective, Vanquish/Clarity or 2,4-D to musk thistle rosettes in spring or fall. Combine control methods into a management system for best results.Musk thistle is an … Curculionidae (70,000 species) is the largest beetle family and one of the largest animal families. R. conicus is likely to have a largely continuous distribution around the Mediterranean corresponding to the distributions of its main host plants (see Hosts/Species Affected). 24 (4), 204. http://www.benhs.org.uk. \Hoddle, M. \Lyon, S. \Reardon, R.]. The economic and social benefits of R. conicus are due to its effective control of the invasive thistle Carduus nutans, which impacts on the grazing and pastoral industries and farmer livelihoods. NODDING THISTLE THE BIOLOGICAL CONTROL OF WEEDS BOOK May 2008 TE WHAKAPAU TARU – ISBN 0 – 478 – 09306 – 3 NODDING THISTLE CROWN WEEVIL Trichosirocalus horridus The history of nodding thistle crown weevils in New Zealand Nodding thistle crown weevils are native to Europe, but they were imported by the DSIR in Newly emerged adults seek aestivation sites in summer in Mediterranean regions, whereas in temperate regions a second partial generation takes place. Woodburn TL, Cullen JM, 1995. by Moran, V. C.\Hoffmann, J. H.]. Electrophoresis helps to indentify which race of the introduced weevil, Rhinocyllus conicus (Coleoptera: Curculionidae), has transferred to two native southern California thistles. The impact of these parasitoids on native R. conicus populations can be very significant, with particularly high levels of egg parasitism. Establishment of an introduced weevil Rhinocyllus (Col., Curculionidae) for the biological control of nodding thistle Carduus nutans (Compositae) in Southern Ontario. And, in the “Ain’t the Internet Grand” category, a Google search for “weevil on thistle” resulted in a quick ID. Length: 3 to 7 mm Range: Alberta Habitat: Near Thistle Time of year seen: May to August Diet: Musk Thistle and Plumeless Thistle Other: This species is native to Europe and was imported to Canada in 1968 for biological control of Thistles. 5-Year Review: Summary and Evaluation. Washington, DC, USA: USDA Forest Service. In: Sacramento Mountains thistle (Cirsium vinaceum). In: Proceedings I of the 10th Australian Weeds Conference and 14th Asian Pacific Weed Science Society Conference, Brisbane, Australia, 6-10 September, 1993 [ed. Effect of inflorescence-feeding insects on the demography and lifetime fitness of a native plant. Global Biodiversity Information Facility. Rhinocyllus conicus, the thistle head weevil, and another weevil, trichosirocalus mortadelo, have been effectively used in Canada on thistles, including the nodding kind. by Delfosse ES, Scott RR]. Data source for updated system data added to species habitat list. Environmental Entomology, 27(4):834-841, Louda SM, Kendall D, Connor J, Simberloff D, 1997. [Proceedings of the Eighth International Symposium on Biological Control of Weeds], [ed. Southwestern Entomologist, 36(1):77-84. http://sswe.tamu.edu/, Page AR, Lacey KL, 2006. The weevil proved an effective agent against C. nutans and also attacked another exotic plumeless thistle, C. acanthoides. (Col., Curculionidae), a successful agent for biocontrol of the thistle, Carduus nutans L. Zeitschrift für Angewandte Entomologie, 97(1):36-62, Alonso-Zarazaga MA, Talamelli F, 2011. 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