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Parasitism of a successful weed biological control agent, Neogalerucella calmariensis

  • Kathryn Norman (a1), Naomi Cappuccino (a1) and Mark R. Forbes (a1)


We investigated parasitism of the purple loosestrife beetle, Neogalerucella calmariensis (L.) (Coleoptera: Chrysomelidae), an introduced weed biological control agent, at 13 sites in eastern Ontario and western Quebec, Canada. Beetles were parasitized by gregarine gut protozoans (Apicomplexa: Eugregarinida) and much less commonly by nematodes (Nematoda: probably Mermithidae) and ectoparasitic mites (Acari: Erythraeidae). Female beetles had more gregarines than did males and the gregarine load was marginally higher in individuals from the original release sites than in individuals from recently colonized sites. Despite its overall success as a biological control agent, N. calmariensis harbours a substantial parasite load.

Nous étudions le parasitisme chez Neogalerucella calmariensis (L.) (Coleoptera: Chrysomelidae), un agent introduit de lutte biologique contre les mauvaises herbes, à 13 sites de l’est de l’Ontario et de l’ouest du Québec, Canada. Les coléoptères sont parasités par des protozoaires intestinaux (grégarines (Apicomplexa: Eugregarinida)) et, moins couramment, par des nématodes (Nematoda: probablement Mermithidae) et des acariens ectoparasites (Acari: Erythraeidae). Les coléoptères femelles portent plus de grégarines que les mâles et la charge de grégarines est légèrement plus élevée chez les individus provenant des sites originaux de libération que chez les individus des sites colonisés récemment. Malgré son succès global comme agent de lutte biologique, Neogalerucella calmariensis porte une importante charge parasitaire.

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Anderson, R.M., and May, R.M. 1979. Population biology of infectious diseases: Part I. Nature (London), 280(5721): 361367 PMID:460412 doi:10.1038/280361a0.
Corrigan, J. 2004. “Ten Years After”—a summary of results for the 2004 tour of release sites from the 1992–1997 Galerucella spp. biological control programs in Ontario. Ontario Ministry of Natural Resources, Toronto, Ontario.
Cosse, A.A. 2004. The presence of tibial spurs as a male sexual characteristic for Galerucella calmariensis (Coleoptera: Chrysomelidae). Journal of Entomological Science, 39: 281283.
Denoth, M., and Myers, J.H. 2005. Variable success of biological control of Lythrum salicaria in British Columbia. Biological Control, 32: 269279 doi:10.1016/j.biocontrol.2004.10.006.
Ehler, L.E. 1998. Invasion biology and biological control. Biological Control, 13(2): 127133 doi:10.1006/bcon.1998.0649.
Goeden, R.D., and Louda, S.M. 1976. Biotic interference with insects imported for weed control. Annual Review of Entomology, 21(1): 325342 doi:10.1146/annurev.en.21.010176.001545.
Hecker, K.R., Forbes, M.R., and Léonard, N.J. 2002. Parasitism of damselflies (Enallagma boreale) by gregarines: sex biases and relations to adult survivorship. Canadian Journal of Zoology, 80(1): 162168 doi:10.1139/z01-213.
Hight, S.D., Blossey, B., Laing, J., and Declerck-Floate, R. 1995. Establishment of insect biological control agents from Europe against Lythrum salicaria in North America. Environmental Entomology, 24: 967977.
Hunt-Joshi, T.R., Root, R.B., and Blossey, B. 2005. Disruption of weed biological control by an opportunistic mirid predator. Ecological Applications, 15(3): 861870 doi:10.1890/04-1336.
Landis, D.A., Sebolt, D.C., Haas, M.J., and Klepinger, M. 2003. Establishment and impact of Galerucella calmariensis L. (Coleoptera: Chrysomelidae) on Lythrum salicaria L., and associated plant communities in Michigan. Biological Control, 28(1): 7891 doi:10.1016/S1049-9644(03)00055-0.
Malecki, R.A., Blossey, B.B., Hight, S.D., Schroeder, D., Kok, L.T., and Coulson, J.R. 1993. Biological control of purple loosestrife. BioScience, 43(10): 680686 doi:10.2307/1312339.
Manguin, S., White, R., Blossey, B., and Hight, S.D. 1993. Genetics, taxonomy, and ecology of certain species of Galerucella (Coleoptera: Chrysomelidae). Annals of the Entomological Society of America, 86: 397410.
McAvoy, T.J., and Kok, L.T. 2004. Temperature dependent development and survival of two sympatric species, Galerucella calmariensis and G. pusilla, on purple loosestrife. BioControl, 49(4): 467480 doi:10.1023/B:BICO.0000034611.30572.99.
McEvoy, P.B. 2002. Insect–plant interactions on a planet of weeds. Entomologia Experimentalis et Applicata, 104(1): 165179 doi:10.1046/j.1570-7458.2002.01004.x.
SAS Institute Inc. 2007. JMP. Version 7. SAS Institute Inc., Cary, North Carolina.
Schooler, S.S., and McEvoy, P.B. 2006. Relationship between insect density and plant damage for the golden loosestrife beetle, Galerucella pusilla, on purple loosestrife (Lythrum salicaria). Biological Control, 36: 100105 doi:10.1016/
Siva-Jothy, M.T., and Plaistow, S.J. 1999. A fitness cost of eugregarine parasitism in a damselfly. Ecological Entomology, 24(4): 465470 doi:10.1046/j.1365-2311.1999.00222.x.
Slansky, F., and Scriber, J.M. 1985. Food consumption and utilization. In Comprehensive insect physiology, biochemistry and pharmacology. Vol. 4. Edited by Kerkut, G.A. and Gilbert, L.I.. Pergamon Press, Oxford, United Kingdom. pp. 87163.
Walde, S.J., and Murdoch, W.W. 1988. Spatial density dependence in parasitoids. Annual Review of Entomology, 33(1): 441466 doi:10.1146/annurev.en.33.010188.002301.

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Parasitism of a successful weed biological control agent, Neogalerucella calmariensis

  • Kathryn Norman (a1), Naomi Cappuccino (a1) and Mark R. Forbes (a1)


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