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Hose selection and oviposition behaviour in West-European ecotypes of Rhinocyllus conicus Froel. (Col., Curculionidae)



Hose selection and oviposition behaviour in West-European ecotypes of Rhinocyllus conicus Froel. (Col., Curculionidae)



Zeitschrift fur Angewandte Entomologie 95(2): 113-122



The food-plant selection and oviposition behaviour in western European ecotypes of Rhinocyllus conicus (Froel.), which is used successfully in the biological control of introduced Carduus spp. in North America, was studied in the laboratory and in field experiments carried out in France, Switzerland and the German Federal Republic. Local or regional food-plant specialisation was developed within the limits of the genera Carduus, Cirsium and Silybum. Data are given on the distribution of R. conicus ecotypes associated with Carduus nutans, S. marianum, Cirsium arvense and C. vulgare. The R. conicus ecotype from western France showed a 90-100% preference for C. vulgare as compared with Carduus nutans, whereas in the laboratory eggs were deposited at about the same rate on both species. An analysis of the number of eggs per flower head revealed a highly significant correlation between these variables both in the field (on Silybum) and in the laboratory (on Cirsium arvense). The role of 'resource predictability' with regard to the marked preference of the western French R. conicus populations for C. vulgare and the possibilities of using this ecotype for the biological control of the weed in other countries are discussed.

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Accession: 001085600

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Host selection and oviposition behaviour in west-European ecotypes of Rhinocyllus conicus Froel. (Col., Curculionidae). Zeitschrift Fuer Angewandte Entomologie: 952: 113-122, 1983

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