Bulletin of Entomological Research (2010) 100, 339-346

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P.J. Gerard, S.L. Goldson, S. Hardwick, P.J. Addison and B.E. Willoughby (2010)
The bionomics of an invasive species Sitona lepidus during its establishment in New Zealand
Bulletin of Entomological Research 100 (3), 339-346
Abstract: The egg, larval, pupal and adult abundance of the clover root weevil Sitona lepidus Gyllenhal (Coleoptera: Curculionidae) was monitored at three sites for the first ten years following the discovery of this exotic pest in the Waikato region of New Zealand. The species went through an initial boom and bust cycle at two sites, with populations reaching up to 1800 larvae m-2. Thereafter, winter larval populations were relatively stable, ranging between 450-750 m-2. Unlike in the Northern Hemisphere, S. lepidus was found to have two generations a year in the Waikato region of New Zealand. Pasture white clover content at the time of peak adult numbers was positively related to the subsequent peak larval populations for each generation. The factors contributing to the emergence of S. lepidus as one of the most important pasture pests in New Zealand are discussed.
(The abstract is excluded from the Creative Commons licence and has been copied with permission by the publisher.)
Link to article at publishers website
Database assignments for author(s): Philippa J. Gerard, Stephen L. Goldson, Scott Hardwick

Research topic(s) for pests/diseases/weeds:
population dynamics/ epidemiology

Pest and/or beneficial records:

Beneficial Pest/Disease/Weed Crop/Product Country Quarant.

Sitona obsoletus Grasses/turf/rangeland New Zealand