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Impact and oviposition behaviour of Ageniaspis fuscicollis (Hymenoptera: Encyrtidae), a polyembryonic parasitoid of the apple ermine moth, Yponomeuta malinellus (Lepidoptera: Yponomeutidae)

Published online by Cambridge University Press:  10 July 2009

U. Kuhlmann ,
D. Babendreier ,
T.S. Hoffmeister  and
N.J. Mills
U. Kuhlmann*
Affiliation:
CABI Bioscience Centre, 1 Rue des Grillons, CH-2800 Delémont, Switzerland
D. Babendreier
Affiliation:
CABI Bioscience Centre, 1 Rue des Grillons, CH-2800 Delémont, Switzerland
T.S. Hoffmeister
Affiliation:
Zoologisches Institut der Universität Kiel - Ökologie, Germany
N.J. Mills
Affiliation:
Center for Biological Control, University of California at Berkeley, USA
*
*Fax: +41 32 422 48 24 E-mail: [email protected]
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Abstract

The distribution and extent of parasitism of the apple ermine moth Yponomeuta malinellus Zeller by the polyembyronic encyrtid parasitoid Ageniaspis fuscicollis (Dalman) were examined in a three year field study and related to oviposition behaviour in the laboratory. Ageniaspis fuscicollis attacks egg batches of its host and kills the final instar larvae, which feed gregariously from within tents. Host population densities in the field were low, from 1.5 to 2.2 tents per 100 leaf clusters, and parasitism increased from 7.8% to 18% over the three year period. Parasitism was independent of host density at the whole tree scale, but at the individual tent scale, the probability of a tent containing parasitized host larvae increased and percent parasitism decreased with the number of host larvae per tent. Observations on the oviposition behaviour of A. fuscicollis in the laboratory revealed that parasitoids distributed their eggs randomly within host egg batches. On average, they spent almost two hours on an egg batch and laid 44% of their egg load of 132 eggs into the first egg batch visited, leading to a mean of 1.4 eggs laid per host egg through frequent self-superparasitism of hosts. The percentage of eggs receiving one or more ovipositions was independent of the size of an egg batch, contradicting our field observations of inverse density dependence. Factors that might account for the differences in rates of parasitism and attack distributions between laboratory and field data are discussed.

Type
Original Articles
Information
Bulletin of Entomological Research , Volume 88 , Issue 6 , December 1998 , pp. 617 - 625
Copyright
Copyright © Cambridge University Press 1998

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