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Chemical basis of host selection in four stenophagous species that feed on convolvulus and calystegia at belleville, ontario
- MOHYUDDIN, A.I.
- Entomologia experimentalis et applicata 1973 v. no. pp. 201-212
- Calystegia sepium, Chelymorpha cassidea, Deloyala guttata, Metriona bicolor, Monodactylus, host preferences, insects, moieties, tropane alkaloids, Ontario
- The chemical basis of host selection in stenophagous insects, Oidaematophorus monodactylus, Metriona bicolor, Deloyala guttata and Chelymorpha cassidea was studied. A compound with the molecular formula C₅H₃NO₄, isolated from a water extract of Calystegia sepium, acted as a recognition factor for O. monodactylus and D. guttata but not for M. bicolor and C. cassidea, indicating that insects feeding on the same plant may be responding to different host recognition factors. This compound is an acid with two carboxyl and one N-methyl groups. It might be a precursor of tropane alkaloids, as the feeding range of O. monodactylus and D. guttata, determined by feeding tests, coincided with the distribution of these compounds. Its structural formula has been proposed.