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Chemical cues from the coffee berry borer influence the locomotory behaviour of its bethylid parasitoids

Published online by Cambridge University Press:  22 March 2010

P. Chiu-Alvarado ,
J. Valle-Mora  and
J.C. Rojas
P. Chiu-Alvarado
Affiliation:
Departamento de Entomología Tropical, El Colegio de la Frontera Sur (ECOSUR), Carretera Antiguo Aeropuerto Km 2.5, Tapachula, Chiapas, México Department of Zoology, Oxford University, South Park Rd, OxfordOX1 3PS, UK
J. Valle-Mora
Affiliation:
Departamento de Entomología Tropical, El Colegio de la Frontera Sur (ECOSUR), Carretera Antiguo Aeropuerto Km 2.5, Tapachula, Chiapas, México
J.C. Rojas*
Affiliation:
Departamento de Entomología Tropical, El Colegio de la Frontera Sur (ECOSUR), Carretera Antiguo Aeropuerto Km 2.5, Tapachula, Chiapas, México
*
*Author for correspondence Fax: +52 962628906 E-mail: [email protected]
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Abstract

Cephalonomia stephanoderis and Prorops nasuta are two bethylid wasps released into several Latin American countries for classical biological control of coffee berry borer, Hypothenemus hampei, the most serious insect pest of coffee worldwide. Recent studies on the host location behaviour of these parasitoids have shown that females of both species are attracted to volatile compounds released by immature stages and dust and frass of H. hampei. In this study, we investigated the role of the contact chemicals present in dust and frass of H. hampei on the behaviour of P. nasuta and C. stephanoderis females. Parasitoids remained longer on patches treated with methanol extracts than on acetone and hexane extracts. Females spent more time on the patch treated with the methanol extract of dust and frass than on the patches treated with the methanol extract of dry coffee and methanol control. The concentration of the methanol extracts from dust and frass influenced the locomotory activity of parasitoids of both species. The time that females spent in the patch tended to increase as the concentration of the methanol extracts increased. A further experiment aimed to identify other behavioural descriptors and gain a deeper understanding of the mechanisms underlying the response of parasitoids to methanol extracts was performed. Females of both species spent more time, covered more distance, turned more (per unit time and per unit distance), and decreased their speed when they contacted patches treated with methanol extracts in comparison to patches treated with methanol control.

Keywords

host locationarrestantsparasitoidsHypothenemus hampeiProrops nasutaCephalonomia stephanoderis
Type
Research Paper
Information
Bulletin of Entomological Research , Volume 100 , Issue 6 , December 2010 , pp. 707 - 714
Copyright
Copyright © Cambridge University Press 2010

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