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LABORATORY PROPAGATION OF CEUTHORRHYNCHIDIUS HORRIDUS (COLEOPTERA: CURCULIONIDAE),1 AN INTRODUCED WEEVIL FOR BIOCONTROL OF CARDUUS THISTLES2

Published online by Cambridge University Press:  31 May 2012

J.T. Trumble  and
L.T. Kok
J.T. Trumble
Affiliation:
Department of Entomology, Virginia Polytechnic Institute and State University, Blacksburg, Virginia 24061
L.T. Kok
Affiliation:
Department of Entomology, Virginia Polytechnic Institute and State University, Blacksburg, Virginia 24061
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Abstract

The development of Ceuthorrhynchidius horridus (Panzer) was observed on five diets consisting of less than 15% dry weight of host-plant material. Adult yields per inoculated larvae were low (less than 1%), although yields from uncontaminated last instars reached as high as 16.6%. Comparisons of diet versus plant-reared weevils showed that (1) larval weight gain at 28 days was significantly greater for plant-reared larvae, (2) plant-reared adults were significantly larger than diet-grown weevils, but there was no difference in fertility, and (3) egg size, viability, and first instar head capsule widths were not significantly different for progeny from diet and plant-reared weevils.

Type
Articles
Information
The Canadian Entomologist , Volume 110 , Issue 10 , October 1978 , pp. 1091 - 1094
Copyright
Copyright © Entomological Society of Canada 1978

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References

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