Bulletin of Entomological Research (2005) 95, 429-436

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C. Hausmann, L. Mattiacci and S. Dorn (2005)
Role of host feeding niches and host refuges in habitat-related behaviour of Hyssopus pallidus (Hymenoptera: Eulophidae), a larval parasitoid of the codling moth
Bulletin of Entomological Research 95 (5), 429-436
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.
(The abstract is excluded from the Creative Commons licence and has been copied with permission by the publisher.)
Link to article at publishers website
Database assignments for author(s): Silvia Dorn

Research topic(s) for pests/diseases/weeds:
biocontrol - natural enemies
Research topic(s) for beneficials or antagonists:
environment/habitat manipulation
general biology - morphology - evolution

Pest and/or beneficial records:

Beneficial Pest/Disease/Weed Crop/Product Country Quarant.

Cydia pomonella Apple (Malus)
Cydia pomonella Apricot (Prunus armeniaca)
Cydia pomonella Pear (Pyrus)
Cydia pomonella Plum/prune (Prunus domestica)
Hyssopus pallidus (parasitoid) Cydia pomonella Apple (Malus)
Hyssopus pallidus (parasitoid) Cydia pomonella Apricot (Prunus armeniaca)
Hyssopus pallidus (parasitoid) Cydia pomonella Pear (Pyrus)
Hyssopus pallidus (parasitoid) Cydia pomonella Plum/prune (Prunus domestica)