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Prey sex pheromone as kairomone for a new group of predators (Coleoptera: Dasytidae, Aplocnemus spp.) of pine bast scales

Published online by Cambridge University Press:  02 February 2011

M. Branco ,
I. van Halder ,
J.C. Franco ,
R. Constantin  and
H. Jactel
M. Branco*
Affiliation:
Centro de Estudos Florestais (CEF), Instituto Superior de Agronomia, Technical University of Lisbon (ISA-UTL), 1349-017 Lisbon, Portugal
I. van Halder
Affiliation:
INRA, UMR1202 Biodiversity Genes & Communities, Laboratory of Forest Entomology & Biodiversity, 69 Route d'Arcachon, F-33612 Cestas, France
J.C. Franco
Affiliation:
Centro de Estudos Florestais (CEF), Instituto Superior de Agronomia, Technical University of Lisbon (ISA-UTL), 1349-017 Lisbon, Portugal
R. Constantin
Affiliation:
103 impasse de la Roquette, F-50000 Saint-Lô, France
H. Jactel
Affiliation:
INRA, UMR1202 Biodiversity Genes & Communities, Laboratory of Forest Entomology & Biodiversity, 69 Route d'Arcachon, F-33612 Cestas, France
*
*Author for correspondence Fax: +351 213653338 E-mail: mrbranco@isa.utl.pt
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Abstract

During the last decades, an increasing number of predators were found to use specific prey pheromones as chemical cues. Beyond its ecological relevance, this knowledge has practical applications on insect conservation and pest control. In this study, we present first evidence that two species of the family Dasytidae (Coleoptera) Aplocnemus brevis Rosenhauer and A. raymondi Sainte-Claire Deville use the sex pheromone of the pine bast scale Matsucoccus feytaudi Ducasse (Hemiptera: Matsucoccidae) as kairomone to locate this prey. The feeding habits and biology of Aplocnemus species are practically unknown. In the laboratory, the adults of Aplocnemus sp. accepted M. feytaudi egg masses as food source as well as other diets. Females represented more than 90% of Aplocnemus sp. attracted to the pheromone lures. We believe that females use this olfactory cue to locate suitable places for oviposition and that larvae are the predators of Matsucoccus. This study further demonstrates that the response to the kairomone elicited short prey searching times, about 23% of the individuals appeared less than 12 min after lure exposure, being consistent with the hypothesis of prey specialization. Habitat and geographical distribution predict an ancestral association of A. brevis with M. feytaudi and of A. raymondi with M. pini. Nevertheless, a recent prey shift of A. raymondi to the invasive M. feytaudi in Corsica is in progress.

Keywords

kairomoneprey searchingMatsucoccusDasytidaeAplocnemusPinus
Type
Research Paper
Information
Bulletin of Entomological Research , Volume 101 , Issue 6 , December 2011 , pp. 667 - 674
Copyright
Copyright © Cambridge University Press 2011

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