Ultrastructure of sensory receptors on the labium of the cassava mealybug,Phenacoccus manihoti Matile Ferrero |
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| Authors: | B. Le Rü ,Sophie Renard,Marie-Rose Allo,J. Le Lannic,J. P. Rolland |
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| Affiliation: | (1) Laboratoire d’Entomologie Fondamentale et Appliquée, Université de Rennes I, Campus de Beaulieu, Avenue du Général Leclerc, 35042 Rennes Cédex, France;(2) Faculté des sciences agronomiques de Gembloux, UER de Zoologie générale et appliquée, B-5030 Gembloux, Belgium;(3) Centre Commun de microscopie Electronique à Balayage, Université de Rennes 1, BP. 25 A, 35042 Rennes Cédex, France;(4) Laboratoire de Biologie Cellulaire, URA no 256, Université de Rennes I, Campus de Beaulieu, 35042 Rennes Cédex |
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| Abstract: | The ultrastructure of the sensory receptors located on the labium of the cassava mealybugPhenacoccus manihoti Matile-Ferrero (Homoptera, Pseudococcidae) was studied with scanning and transmission electron microscopes. Trichoid hairs of probable mechanoreceptive function are distributed over the labium. Uniporous chemosensilla which possess a mechanoreceptive dendrite, multiporous chemosensilla and mechanoreceptive pegs are present on the tip of the labium. The presence of contact and olfactory chemoreceptors on the labial tip ofP. manihoti suggests that tapping it on the cassava leaf provides the pest with information about the chemical nature of the leaf surface. ORSTOM |
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| Keywords: | Homoptera Pseudococcidae sensory organs feeding behavior |
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