Other insects in this community tend to be active later in the flowering periods, but competition in the captula is quite intense. 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. The Oklahoma Cooperative Extension Service and cooperating landowners began a program to release thistle head weevils in northeast Oklahoma in 1991. Range expansion of Rhinocyllus conicus Froelich on musk thistle into southwestern Arkansas. Despite their secretive lifestyle, the larvae are found by parasitoids. Predispersal seed predation on Carduus nutans (Asteraceae) in southern Europe. There is also one pathogen, a â¦ Part 137. The economic benefits of R. conicus as a biological control agent against the exotic thistle Carduus nutans have been very significant in Canada, the USA and New Zealand. 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. © Copyright 2020 CAB International. Global Biodiversity Information Facility. 115-126. Fiâ¦ Rhinocyllus conicus is a weevil, native to Europe and western Asia, that has been introduced into several countries as a biological control agent for some exotic invasive thistle species (Boldt and Kok, 1982). In 1968 the weevil was introduced to Saskatchewan and Ontario from Alsace, France, and the Rhine valley, Germany. Maw (1982) also found eggs on the native C. flodmanii (Rydb.) Once the adults have located host populations they become much more sedentary. California, USA: University of California Division of Agriculture and Natural Resources. sp. Pesticides should always be used in a lawful manner, consistent with the product's label. Pitcher's thistle (Cirsium pitcheri). Washington, DC, USA: USDA Forest Service. Coleopterorum Catalogus. ZwÃ¶lfer H, Harris P, 1984. Further details may be available for individual references in the Distribution Table Details section which can be selected by going to Generate Report. The distribution in this summary table is based on all the information available. Andres LA, Rees NE, 1995. Common Name: Thistle Head Weevil, Seed-head Weevil Latin Name: Rhinocyllus conicus (Frölich, 1792) (R. Bercha, det.) 2010), Based on impact on native thistles (Louda et al. Zoological Journal of the Linnean Society. > 0Â°C, dry winters), Continental climate, wet all year (Warm average temp. In: DSIR Information Series, 105 37. Plants Database. 5-Year Review: Summary and Evaluation. From Saskatchewan and Ontario R. conicus was moved and released into the USA, in Virginia and Montana, in 1969. Carduus nutans L., nodding thistle and C. acanthoides L., plumeless thistle (Compositae). Thistle head weevil (Rhinocyllus conicus); larvae and pupae (two pupae on right). In: Proceedings I of the 10th Australian Weeds Conference and 14th Asian Pacific Weed Science Society Conference, Brisbane, Australia, 6-10 September, 1993 [ed. They can infest roadsides and ditches, range and pasture lands. A sixth species, R. inquilinus Gyll., described from Finland, appears to be a small individual of R. conicus (Zwölfer and Harris, 1984). 29. Milk thistle. Populations of the weevil from south-west France were released against spear thistle Cirsium vulgare in the state of Victoria in Australia in 1989, but establishment has been poor since (Sagliocco et al., 2012). Biology and host specificity of Rhinocyllus conicus (Froel.) They traveled to New Zealand in 1973, to Argentina in 1980, and to Australia in 1989. (Unruh and Goeden, 1987). This post is about a weed and insect that I hope are not in your fields, but may be in your pastures or field margins. Jessep CT, 1981. Biological control in the western United States, 3361 [ed. http://data.gbif.org, Goeden RD, 1995. Image 1594211 is of musk thistle head weevil (Rhinocyllus conicus ) larva(e) on musk thistle. Woodburn, 1996); however, amongst the native thistles R. conicus competes in the developing capitula with native insects, particularly tephritid seed flies, and may locally threaten the population viability of such flies (Tatyana and Louda, 2011). Release and establishment of the thistle-head weevil, Rhinocyllus conicus, in Australia. The risks of the introduction and spread of R. conicus to other regions is limited, as it is specific to a few genera of host plants and has only left its native range through deliberate release as a biological control agent. In: Proceedings of the 28th New Zealand Weed and Pest Control Conference. It was assumed that the weevil would stick to its non-native targets, but by the mid-‘90’s, it was obvious that the NTRBs weren’t limiting themselves to exotic thistles. 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