Eur. J. Entomol. 108 (3): 487-488, 2011 | DOI: 10.14411/eje.2011.062

Parasitylenchus sp. (Tylenchomorpha: Allantonematidae) parasitizing field populations of Harmonia axyridis (Coleoptera: Coccinellidae)

Susanne HARDING1, George O. POINAR2, Desislava V. DIMITROVA1, Tove STEENBERG3
1 University of Copenhagen, Department of Agriculture and Ecology, Thorvaldsensvej 40, 1875 Frederiksberg C. (Copenhagen) DK - Denmark; e-mail: suha@life.ku.dk
2 Oregon State University, Department of Zoology, 3029 Cordley Hall, Corvallis, Oregon 97331-2914; e-mail: poinarg@science.oregonstate.edu
3 University of Aarhus, Department of Integrated Pest Management, Research Centre Flakkebjerg, ForsIgsvej 1,
4 200 Slagelse, DK - Denmark; e-mail: tove.steenberg@agrsci.dk

Adults of the invasive harlequin ladybird, Harmonia axyridis (Coleoptera: Coccinellidae), were found to be parasitized by nematodes (Tylenchomorpha: Allantonematidae) in Denmark. The nematodes were identified as Parasitylenchus sp. Major morphological characters of the nematodes did not differ significantly from Parasitylenchus coccinellinae Iperti & van Waerebeke 1968, but minor deviations in egg dimension and tail length were measured. Parasitism was only recorded in early autumn, with prevalence ranging from 2 to 33%. Adult and juvenile nematodes occurred together in the body cavity of both female and male H. axyridis.

Keywords: Coccinellidae, Harmonia axyridis, parasitic nematodes, Allantonematidae, Parasitylenchus sp., field parasitism, invasive species

Received: June 28, 2010; Revised: December 22, 2010; Accepted: December 22, 2010; Published: July 1, 2011  Show citation

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HARDING, S., POINAR, G.O., DIMITROVA, D.V., & STEENBERG, T. (2011). Parasitylenchus sp. (Tylenchomorpha: Allantonematidae) parasitizing field populations of Harmonia axyridis (Coleoptera: Coccinellidae). EJE, 108(3), 487-488. doi: 10.14411/eje.2011.062
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