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Role of host feeding niches and host refuges in habitat-related behaviour of Hyssopus pallidus (Hymenoptera: Eulophidae), a larval parasitoid of the codling moth

Published online by Cambridge University Press:  09 March 2007

C. Hausmann ,
L. Mattiacci  and
S. Dorn
C. Hausmann
Affiliation:
Institute of Plant Sciences, Applied Entomology, Swiss Federal Institute of Technology (ETH), Clausiusstrasse 25, CH-8092 Zurich, Switzerland
L. Mattiacci
Affiliation:
Institute of Plant Sciences, Applied Entomology, Swiss Federal Institute of Technology (ETH), Clausiusstrasse 25, CH-8092 Zurich, Switzerland
S. Dorn*
Affiliation:
Institute of Plant Sciences, Applied Entomology, Swiss Federal Institute of Technology (ETH), Clausiusstrasse 25, CH-8092 Zurich, Switzerland
*
*Fax: +41 1 6321171 E-mail: silvia.dorn@ipw.agrl.ethz.ch
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Abstract

Parasitoid fitness depends largely on the capability to locate a host in an ecosystem. A parasitoid of a polyphagous host might not be able to find or to access the host in all its feeding niches. This study evaluated the niche selection of Hyssopus pallidus (Askew), a larval parasitoid of Cydia pomonella (Linnaeus), at the plant level with the goal of assessing its potential for biological control on different fruit crops throughout the plant cycle. Parasitoid behaviour during host location and reproduction rate were investigated on host caterpillars actively feeding on apple, pear, apricot or plum, and on caterpillars diapausing under the bark. Under laboratory conditions, the host searching behaviour of H. pallidus varied depending on the fruit species offered and the infestation of the fruits. Parasitoid females searched longer on apples than on other fruit species, and they searched longer on infested than on uninfested apples. Female wasps were able to locate and parasitize host caterpillars under the tree bark, and their behaviour did not vary with host accessibility. The numbers of caterpillars attacked by H. pallidus depended on the fruit species. The highest numbers of caterpillars were parasitized in apples and apricots. Their accessibility (i.e. position) within the fruit or on the branch did not influence parasitism success. Although hosts were parasitized throughout the season, the best results were achieved with early and late releases. Therefore, the host niche selection behaviour of H. pallidus most likely co-evolved with the host C. pomonella on apples, which renders H. pallidus a valuable biocontrol agent for successful release at different times of the season into apple orchards.

Keywords

Hyssopus pallidusCydia pomonellaHymenopteraLepidopteraTortricidaeEulophidaeapplebehaviourhost locationniche selection
Type
Research Article
Information
Bulletin of Entomological Research , Volume 95 , Issue 5 , October 2005 , pp. 429 - 436
Copyright
Copyright © Cambridge University Press 2005

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