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Study of Elaeidobius spp. and Grasidius hybridus population activity using a new trapping method during oil palm anthesis (Coleoptera, Curculionidae)

Beaudoin-Ollivier L., Flori A., Syahputra I., Nodichao L., Poveda R., Louise C.. 2017. Bulletin de la Société Entomologique de France, 122 (2) : p. 151-170.

A new design of interception trap has been developed to study the activity of two major oil palm pollinator insects, the weevils Elaeidobius spp. and Grasidius hybridus, visiting inflorescences in anthesis. The trap has been studied for the two species Elaeis guineensis (West Africa, South-east Asia and South America) and Elaeis oleifera and two interspecific hybrids (South America). The results allowed the identification of the period of insect activity during anthesis and the monitoring of the species and number of insects visiting both male and female inflorescences in anthesis. The trap design seems convenient for future population dynamics and dispersal studies in oil palm plantations. The results indicate that Elaeidobius spp. have diurnal flying activity whereas such activity occurs during dusk to nocturnal periods for G. hybridus. The weevils are highly host-specific, but variability is apparent for hybrids.

Mots-clés : pollinisateur; elaeidobius; pollinisation; elaeis guineensis; elaeis oleifera; piégeage des animaux; insecta; piège; bénin; Équateur; indonésie; grasidius hybridus

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