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HOST SPECIFICITY AND BIOLOGY OF UROPHORA CARDUI (DIPTERA: TEPHRITIDAE). A BIOCONTROL AGENT FOR CANADA THISTLE (CIRSIUM ARVENSE)

Published online by Cambridge University Press:  31 May 2012

D. P. Peschken  and
P. Harris
D. P. Peschken
Affiliation:
Research Station, Canada Department of Agriculture, Regina, Saskatchewan
P. Harris
Affiliation:
Research Station, Canada Department of Agriculture, Regina, Saskatchewan
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Abstract

The biology of Urophora cardui (L.) (Diptera: Tephritidae) and its suitability as a biocontrol agent for Canada thistle (Cirsium arvense (L.) Scop.) were investigated. The incubation period of the eggs was 4.3 days at 27 °C. Crowding did not significantly reduce the longevity of the adults, the number of eggs laid, or the egg hatch. U. cardui overwinters as a mature larva in the gall but pupation and further development ensue when the larvae are exposed to air by opening the gall. The roots of single and double-galled plants weighed 65 and 78% less and the combined weights of the stem and leaves 47 and 58% less respectively than plants without galls. U. cardui is monophagous: it oviposits into Canada thistle and if kept without this host, into the closely related weeds Cirsium vulgare (Savi) Ten. and Carduus acanthoides L. U. cardui is a promising biological control agent and should be released in Canada.

Canada thistle (Cirsium arvense (L.) Scop.) is a widespread noxious weed in Canada and the northern United States. This paper reports on the biology of Urophora cardui (L.), a European tephritid, and its suitability for introduction into Canada to aid in the control of the thistle.

Type
Articles
Information
The Canadian Entomologist , Volume 107 , Issue 10 , October 1975 , pp. 1101 - 1110
Copyright
Copyright © Entomological Society of Canada 1975

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