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FIRST REPORT OF THE ESTABLISHMENT OF CYPHOCLEONUS ACHATES (FAHRAEUS) (COLEOPTERA: CURCULIONIDAE) ON SPOTTED KNAPWEED, CENTAURE A MACULOSA LAMARCK, IN THE UNITED STATES

Published online by Cambridge University Press:  31 May 2012

J.M. Story ,
W.R. Good  and
L.J. White
J.M. Story
Affiliation:
Montana Agricultural Experiment Station, Western Agricultural Research Center, Corvallis, Montana,USA 59828
W.R. Good
Affiliation:
Montana Agricultural Experiment Station, Western Agricultural Research Center, Corvallis, Montana,USA 59828
L.J. White
Affiliation:
Montana Agricultural Experiment Station, Western Agricultural Research Center, Corvallis, Montana,USA 59828
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Extract

Cyphocleonus achates (Fahaeus) is a Eurasian, root-feeding weevil introduced into North America for the biological control of spotted knapweed, Centaurea maculosa Lamarck. Stinson et al. (1994) reported that C. achates is one of the most damaging root-feeding insects on knapweed in Eurasia and should be a valuable addition to the biocontrol effort in North America. The biology, host specificity, and potential impact of the weevil were described by Stinson et al. (1994). Larvae mine into the root cortex where they induce formation of a conspicuous root gall. Feeding by older larvae causes much damage, especially to small plants or plants containing several larvae. The weevil overwinters as a larva in the root and emerges as an adult from mid-July to October. Adult weevils are large (14 mm long) and flightless, and feed on knapweed foliage. The weevil has one generation per year.

Type
Note
Information
The Canadian Entomologist , Volume 129 , Issue 2 , April 1997 , pp. 373 - 374
Copyright
Copyright © Entomological Society of Canada 1997

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References

Harris, P. 1991. Classical biocontrol of weeds: Its definition, selection of effective agents, and administrative-political problems. The Canadian Entomologist 123: 827–849.CrossRefGoogle Scholar
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