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Biological control of plumeless thistle (Carduus acanthoides L.) in Argentina

Published online by Cambridge University Press:  12 June 2017

Susana R. Feldman
Susana R. Feldman*
Affiliation:
Cátedra de Biología General, Facultad de Ciencias Agrarias, Universidad Nacional de Rosario, C.C.14, 2123 Zavalla, República Argenrina
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Abstract

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.

Keywords

Plumeless thistle, Carduus acanthoides L. CRUACmusk thistle, Carduus nutans L. CRUNUbull thistle, Cirsium vulgare (Savi) Tenore CIRVUweevil, Rhinocyllus conicus FroelichCRUACCRUNUCIRVU
Type
Weed Management
Information
Weed Science , Volume 45 , Issue 4 , August 1997 , pp. 534 - 537
Copyright
Copyright © 1997 by the Weed Science Society of America 

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