Host Specificity of the First-Instar of Ceuthorhynchidius horridus a Weevil for Biological Control of Thistles

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Feeding tests of the 1st instar of Ceuthorhynchidius horridus (Panzer) on 35 species of plants representing 7 families revealed that the larvae survived and developed on a narrow range of plant species within the tribes Cynareae and Cichorieae of the family Compositae. The host specificity index (HSI) and the index of survivability (IS) were used to rank the tested plants. The HSI is based on feeding tunnel length and longevity for the entire test while the IS is based on percent survival and larval growth during the 1st 5 days of the test. Correlation between the 2 indices is high (r = 0.95, P < 0.01). Both indices indicated a relatively high larval host acceptability for bull, Canada, musk, plumeless, Scotch and star thistles, immortelle, and lettuce. Musk, plumeless and bull thistles, and globe artichoke supported some larval growth to the 3rd instar.

Document Type: Research Article

Publication date: December 1, 1974

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  • Journal of Economic Entomology is published bimonthly in February, April, June, August, October, and December. The journal publishes articles on the economic significance of insects and is divided into the following sections: apiculture & social insects; arthropods in relation to plant disease; forum; insecticide resistance and resistance management; ecotoxicology; biological and microbial control; ecology and behavior; sampling and biostatistics; household and structural insects; medical entomology; molecular entomology; veterinary entomology; forest entomology; horticultural entomology; field and forage crops, and small grains; stored-product; commodity treatment and quarantine entomology; and plant resistance. In addition to research papers, Journal of Economic Entomology publishes Letters to the Editor, interpretive articles in a Forum section, Short Communications, Rapid Communications, and Book Reviews.
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