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J Gen Virol 84 (2003), 1799-1807; DOI 10.1099/vir.0.19038-0

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© 2003 Society for General Microbiology

The cypovirus Diadromus pulchellus RV-2 is sporadically associated with the endoparasitoid wasp D. pulchellus and modulates the defence mechanisms of pupae of the parasitized leek-moth, Acrolepiopsis assectella

Sylvaine Renault1, Sylvie Bigot1, Monique Lemesle2, Pierre-Yves Sizaret2 and Yves Bigot1

1 Laboratoire d'Etude des Parasites Génétiques, CNRS-FRE 2535, Université François Rabelais, UFR des Sciences et Techniques, Parc Grandmont, 37200 Tours, France
2 Service de Microscopie Electronique, Université François Rabelais, UFR de Médecine, 2 bis Boulevard Tonnellé, 37032 Tours, France

Correspondence
Sylvaine Renault
renault{at}univ-tours.fr

Diadromus pulchellus is a solitary endoparasitoid wasp that parasitizes the pupae of the leek-moth, Acrolepiosis assectella (Lepidoptera). Hitherto, every individual D. pulchellus from France that has been investigated was infected by an orthoreovirus, DpRV-1, and an ascovirus, DpAV-4. Recently, a new strain of D. pulchellus, established from a French field population, was found to be able to develop on leek-moth pupae, but lacked both DpRV-1 and DpAV-4. However, all these wasps were infected with a new cypovirus, DpRV-2. This cypovirus is transmitted to the A. assectella pupae at each wasp oviposition and is replicated mainly in the gut cells of the parasitized pupae. DpRV-2, like the ascovirus DpAV-4, is able to inhibit the defence reaction of A. assectella pupae and so contributes to the parasitic success of D. pulchellus wasps.






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