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EFFECT OF UROPHORA CARDUI (L.) (DIPTERA: TEPHRITIDAE) AND CEUTORHYNCHUS LITURA (F.) (COLEOPTERA: CURCULIONIDAE) ON THE WEED CANADA THISTLE, CIRSIUM ARVENSE (L.) SCOP.

Published online by Cambridge University Press:  31 May 2012

D.P. Peschken  and
J.L. Derby
D.P. Peschken
Affiliation:
Research Station, Agriculture Canada, Box 440, Regina, Saskatchewan, CanadaS4P 3A2
J.L. Derby
Affiliation:
Research Station, Agriculture Canada, Box 440, Regina, Saskatchewan, CanadaS4P 3A2
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Abstract

Stress caused by two biocontrol agents on their weed host Canada thistle [Cirsium arvense (L.) Scop., Asteraceae] was investigated. The combined attack of the gall-fly Urophora cardui (L.) (Diptera: Tephritidae) and the stem-mining weevil Ceutorhynchus litura (F.) (Coleoptera: Curculionidae) caused a significant reduction in the vigour of the attacked plants as measured by the number of live buds in the 1st year and by the dry weight of the roots in the 3rd year. The attacks did not significantly reduce the number of aborted buds, mature seed heads, and new shoots, nor the combined dry weight of the leaves, stems, and galls as compared with Canada thistle plants that had not been galled or mined, in any of the 3 years. Non-structural carbohydrate content of the roots of attacked shoots was found significantly reduced only at the end of the mining period.

Résumé

Le stress engendré par deux agents de contrôle du Chardon des champs [Cirsium arvense (L.) Scop., Asteraceae] a été évalué. L’attaque combinée de la mouche gallicole Urophora cardui (L.) (Diptera : Tephritidae) et du charançon mineur des tiges Ceutorhynchus litura (F.) (Coleoptera : Curculionidae) a réduit considérablement la vigueur des plants affectés à en juger par le nombre de bourgeons vivants la 1ère année et par la masse sèche des racines la 3me année. Après comparaison des plants affectés à des plants restés sains au cours de ces 3 années, il faut conclure que les attaques n’ont pas diminué significativement le nombre de bourgeons avortés, le nombre de fructifications ou le nombre de nouvelles pousses, ni non plus les masses sèches combinées des feuilles, tiges et galles. Le contenu en hydrates de carbone non relié à la structure des racines s’est avéré significativement réduit dans les plants attaqués seulement à la fin de la période de minage.

[Traduit par la rédaction]

Type
Articles
Information
The Canadian Entomologist , Volume 124 , Issue 1 , February 1992 , pp. 145 - 150
Copyright
Copyright © Entomological Society of Canada 1992

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