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Does a Specialist Parasitoid Adapt to its Host on a New Host Plant?

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The host plant expansion of a diamondback moth, Plutella xylostella (L.) (DBM) strain to snowpea (Pisum sativum L.) raised the question whether a specialist parasitoid Diadegma semiclausum (DS) could be conditioned to locate and parasitize its host on the new host plant. In a specialist parasitoid a behavioural change towards a plant outside the normal host plant range of its host due to developmental experience is not expected. The responsive behaviour, parasitism rates and fitness of three subsequent DS generations were investigated on the snowpea-strain of DBM. After three generations of DS on the pea 62.5% of females chose an DBM-infested pea plant over DBM infested cabbage. Only 16.4% of cabbage-reared DS was attracted to infested pea. Rearing of the parasitoid in host larvae on peas significantly increased the number of larvae parasitized on this host plant in the first generation; however, there was no further increase in generations 2 and 3. Larval mortality was similar for all parasitoid/DBM combinations on both host plants, but significantly higher mortality occurred in parasitoid pupae from peas. Development time of the parasitoid was slightly prolonged on the pea strain of DBM. The number of females produced by parasitoids reared on the pea strain of DBM was significantly reduced as compared to D. semiclausum reared on the cabbage strain on both host strains. Results show that DS has the potential to change its responsive behaviour in order to locate its host on a new host plant. According to the current view, a specialist parasitoid is not expected to change its reaction to a plant outside the normal host plant range of its host. Within 3 generations, responsive behaviour towards snowpea could be increased. However, fitness trade-offs, especially an extreme shift in sex ratio to males reduced reproductive success.

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ACKNOWLEDGMENTS

The study was conducted within the ICIPE-led project “entitled Biocontrol of Diamondback Moth in East Africa,” financed by the German Federal Ministry of Economic Cooperation and Development (BMZ). The first author and the research were funded by the German Research Foundation (DFG). We further thank J. Steidle for his very helpful comments regarding an earlier version of this manuscript.

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Authors and Affiliations

  1. Institute of Plant Pathology and Plant Protection, Entomological Section, Georg-August-University Goettingen, Grisebachstrasse 6, 37075, Goettingen, Germany

    A. Roßbach & S. Vidal

  2. International Centre of Insect Physiology and Ecology (ICIPE), P.O. Box 30772, 00100, Nairobi, Kenya

    A. Roßbach & B. Löhr

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  1. A. Roßbach
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  2. B. Löhr
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  3. S. Vidal
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Correspondence to S. Vidal.

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Roßbach, A., Löhr, B. & Vidal, S. Does a Specialist Parasitoid Adapt to its Host on a New Host Plant?. J Insect Behav 19, 479–495 (2006). https://doi.org/10.1007/s10905-006-9040-5

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  • DOI: https://doi.org/10.1007/s10905-006-9040-5

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