Establishment of Rhinocyllus conicus (Coleoptera: Curculionidae) in Georgia for Control of Musk Thistle

Rhinocyllus conicus Froelich was introduced and successfully established at 21 sites in northern Georgia for biological control of musk thistle, Carduus nutans L. A total of 9,310 adults were released from 1990 through 1992. Releases of reproductively mature adults in the spring were much more successful than summer releases of teneral adults. Progeny were observed in all spring-release sites, and population increases occurred at most sites one and two years after release. Consumption of infested capitula by cattle reduced R. conicus numbers at some sites. After two years, weevils had dispersed up to 0.6 km from the initial release point. Transfer of R. conicus to new sites in Georgia will begin in 1993.

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Establishment in Missouri ofRhinocyllus conicusfor the Biological Control of Musk Thistle(Carduus nutans)

Weed Science ◽

10.1017/s004317450004964x ◽

1978 ◽

Vol 26 (2) ◽

pp. 188-190 ◽

Cited By ~ 12

Author(s):

Benjamin Puttler ◽

S. H. Long ◽

E. J. Peters

Keyword(s):

Biological Control ◽

Release Site ◽

Carduus Nutans ◽

Rhinocyllus Conicus ◽

Bracon Mellitor

A weevil,(Rhinocyllus conicusFroelich) was introduced into Missouri in 1975 to aid in reducing populations of musk thistle,(Carduus nutansL.). The weevil was recovered in 1976 from as far as 3.2 km from the release site and 4.8 km in 1977. Infestation levels of flower heads at the release site ranged from 46 to 90%. Native parasites(Bracon mellitorSay) and [Aliolus curculionis(Fitch)] were reared from weevil larvae.

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PARASITISM OF RHINOCYLLUS CONICUS FROELICH (COLEOPTERA: CURCULIONIDAE) IN WYOMING

The Canadian Entomologist ◽

10.4039/ent123929-5 ◽

1991 ◽

Vol 123 (5) ◽

pp. 929-932 ◽

Cited By ~ 4

Author(s):

J.L. Littlefield

Keyword(s):

Biological Control ◽

Carduus Nutans ◽

Parasitic Hymenoptera ◽

Rhinocyllus Conicus

AbstractRhinocyllus conicus Froelich was introduced into Wyoming in 1975 for the biological control of musk thistle, Carduus nutans L. A survey of 15 release sites was conducted in 1986 to determine parasitism of R. conicus. Eight species of parasitic Hymenoptera were identified. Parasitism of R. conicus infecting the flower heads of musk thistle was low (0.6%), but greater for weevils within the peduncles (17%). Parasitism varied among release sites, ranging from 0.0 to 1.3%, but was not significantly correlated with the duration of weevil establishment.

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Interspecific competition between Rhinocyllus conicus and Urophora soistitialis L on nodding thistle in Canterbury

New Zealand Plant Protection ◽

10.30843/nzpp.2005.58.4319 ◽

2005 ◽

Vol 58 ◽

pp. 140-147 ◽

Cited By ~ 1

Author(s):

M.R. McNeill ◽

C.J. Fletcher

Keyword(s):

Interspecific Competition ◽

Insect Species ◽

Carduus Nutans ◽

Rhinocyllus Conicus ◽

Microctonus Aethiopoides

Nodding thistle receptacle weevil Rhinocyllus conicus and gallfly Urophora solstitialis attack the capitula of nodding thistle Carduus nutans L Between 31 October and 15 December 2003 the phenology of both R conicus and U solstitialis was studied at a dryland site in Canterbury Adult R conicus were more numerous than U solstitialis on capitula throughout the experiment Larvae of R conicus were first found on 11 November (15 of capitula infested) and peaked on 2 December with 53 of capitula infested Only 3 of capitula were infested by U solstitialis Adult R conicus or U solstitialis emerged from 79 of the selected primary and secondary capitula The majority of infested capitula (81) contained only R conicus 2 contained only U solstitialis while 17 contained both insect species Parasitism of R conicus by the braconid parasitoid Microctonus aethiopoides was low and occurred when most weevil eggs had been laid

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Biology and host specificity of Rhinocyllus conicus (Froel.) (Col., Curculionidae), a successful agent for biocontrol of the thistle, Carduus nutans L.1

Zeitschrift für Angewandte Entomologie ◽

10.1111/j.1439-0418.1984.tb03714.x ◽

2009 ◽

Vol 97 (1-5) ◽

pp. 36-62 ◽

Cited By ~ 71

Author(s):

H. ZWÖLFER ◽

P. HARRIS

Keyword(s):

Host Specificity ◽

Carduus Nutans ◽

Rhinocyllus Conicus

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Establishment, dispersal, and prevalence of Rhinocyllus conicus (Coleoptera: Curculionidae), a biological control agent of thistles, Carduus species (Asteraceae), in Argentina, with experimental information on its damage

Biological Control ◽

10.1016/j.biocontrol.2013.07.009 ◽

2013 ◽

Vol 67 (2) ◽

pp. 186-193 ◽

Cited By ~ 2

Author(s):

Alba E. Enrique de Briano ◽

Horacio A. Acciaresi ◽

Juan A. Briano

Keyword(s):

Biological Control ◽

Biological Control Agent ◽

Experimental Information ◽

Control Agent ◽

Rhinocyllus Conicus

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Oviposition response of the biocontrol agent Rhinocyllus conicus to resource distribution in its invasive host, Carduus nutans

Biological Control ◽

10.1016/j.biocontrol.2020.104369 ◽

2021 ◽

Vol 152 ◽

pp. 104369

Author(s):

Zeynep Sezen ◽

Ottar N. Bjørnstad ◽

Katriona Shea

Keyword(s):

Biocontrol Agent ◽

Resource Distribution ◽

Carduus Nutans ◽

Rhinocyllus Conicus

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Dispersal ofRhinocyllus conicusfor Biocontrol of Musk Thistle

Weed Science ◽

10.1017/s0043174500065425 ◽

1976 ◽

Vol 24 (1) ◽

pp. 59-62 ◽

Cited By ~ 15

Author(s):

J. M. Hodgson ◽

N. E. Rees

Keyword(s):

Seed Production ◽

Carduus Nutans ◽

Rhinocyllus Conicus ◽

Made In

A weevil [Rhinocyllus conicus(Froelich)] host specific toCarduus, Cirsium, Silybum, andOnopordum, was introduced into Gallatin County, Montana, for biocontrol of musk thistle (Carduus nutansL.). Releases were made in 1969, 1971, 1972, and 1973 on local musk thistle infestations. The insects became established and overwintered successfully. In 1974,R. conicuswas found over a 1,280-km2area of the county in seed heads of musk thistle. Weevil larvae severely infected the primary flowers, but only a few secondary and later flowers were attacked. Seed production from infected primary flowers was greatly reduced, and other factors influenced reduction of seeds from secondary and later flowers.

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Biological control of plumeless thistle (Carduus acanthoidesL.) in Argentina

Weed Science ◽

10.1017/s0043174500088779 ◽

1997 ◽

Vol 45 (4) ◽

pp. 534-537 ◽

Cited By ~ 4

Author(s):

Susana R. Feldman

Keyword(s):

Biological Control ◽

Oviposition Period ◽

Adult Survival ◽

Slight Tendency ◽

Rhinocyllus Conicus

Plumeless thistle is a European Asteraceae naturalized in Argentina, where it is a troublesome pasture and range weed. A European weevil (Rhinocyllus conicus) was imported for biocontrol of this thistle. Oviposition patterns, egg to adult survival, and the weevil's effect on the production of achenes by thistles were monitored over 2 yr. The oviposition period did not begin simultaneously in all thistle populations, but finished in late November. Egg to larvae survival was 63% and egg to adult survival was approximately 50%. No important egg predators were detected. The weevils destroyed 80% of the propagules per capitulum and showed a slight tendency to adapt to the plumeless thistle cycle.

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