Variation in relation with physiological status of olfactory peripheral sensitivity in four Coleoptera, Callosobruchus maculatus Fab, Bruchidius atrolineatus Pic, Acanthoscelides obtectus Say Bruchidae and Sitona lineatus L Curculionidae Variation en fonction de letat physiologique de la sensibilite olfactive peripherique chez quatre coleopteres, Callosobruchus maculatus Fab, Bruchidius atrolineatus Pic, Acanthoscelides obtectus Say Bruchidae et Sitona lineatus L Curculionidae
Leroy, T.; Pouzat, J.; Biemont, J.-Claude.; Pierre, D.
Annales de la Societe Entomologique de France 35: 159-164
ISSN/ISBN: 0037-9271 Accession: 038876870
The olfactory peripheral sensitivity estimated by recording EAG responses of four Coleoptera is studied. In directly related to reproductive status of the three Bruchidae, peripheral sensitivity varies for Sitona lineatus during a whole cycle, depending on the phenological status of the host plant, the pea Pisum sativum. Male Callosobruchus maculatus and Bruchidius atrolineatus are strongly sensitive to the sexual pheromone released by the females of their respective species, only after the beginning of their sexual activity. The females Acanthoscelides obtectus are clearly less sensitive to male pheromone after coupling. Imagos of Sitona lineatus have two periods of high sensitivity to leguminous odours: in May, during pea crop colonisation, and in September, period during which the insects have to find food (alfalfa, clover, vetch) before winter. The physiological phenomena which could be involved in the changes in olfactory sensitivity are discussed.