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How host larval age, and nutrition and density of the parasitoid Dinarmus basalis (Hymenoptera: Pteromalidae) influence control of Acanthoscelides obtectus (Coleoptera: Bruchidae)

Published online by Cambridge University Press:  09 March 2007

I. Schmale ,
F.L. Wäckers ,
C. Cardona  and
S. Dorn
I. Schmale
Affiliation:
Swiss Federal Institute of Technology (ETH), Institute of Plant Sciences, Applied Entomology, 8092 Zürich, Switzerland
F.L. Wäckers
Affiliation:
Netherlands Institute of Ecology, Center for Terrestrial Ecology, PO Box 40, 6666 ZG Heteren, Netherlands
C. Cardona
Affiliation:
Centro Internacional de Agricultura Tropical, Cali, Colombia
S. Dorn*
Affiliation:
Swiss Federal Institute of Technology (ETH), Institute of Plant Sciences, Applied Entomology, 8092 Zürich, Switzerland
*
*Fax: +41 1 632 39 21 E-mail: silvia.dorn@ipw.agrl.ethz.ch
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Abstract

Choice of the targeted host developmental stage, regulation of parasitoid numbers released and introduction of food supplements are operational factors with a potential to influence the level of biological control. In a closed laboratory storage system maintained over two generations of the host, the impact of these three parameters on the control potential of the parasitoid Dinarmus basalis Rondani was investigated for high populations of larvae of Acanthoscelides obtectus (Say) feeding inside dry common bean seeds Phaseolus vulgaris. The beans were already infested with immature bruchids at the beginning of the storage period to simulate harvest conditions, characterized in a previous study. Treatments resulted in a reduction of 48–75% of the bruchid population within 16 weeks of storage. The best timing of parasitoid release was at the simulated harvest, as later releases reduced the bruchid population only by about half this percentage. Host feeding is postulated to be the key factor involved in the observed difference. The effect of increasing the number of parasitoids strongly depended on host age and food supplement. Addition of vials with honey had no direct effect on the bruchid population or on the parasitoid progeny. The ecological significance of these findings and implications for biological control are discussed.

Type
Review Article
Information
Bulletin of Entomological Research , Volume 95 , Issue 2 , April 2005 , pp. 145 - 150
Copyright
Copyright © Cambridge University Press 2005

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