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1 August 2010 Flight Activity and Dispersal of the Cabbage Seedpod Weevil (Coleoptera: Curculionidae) are Related to Atmospheric Conditions
James A. Tansey, Lloyd M. Dosdall, Andrew Keddie, Owen Olfert
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Abstract

The cabbage seedpod weevil, Ceutorhynchus obstrictus (Marsham) (Coleoptera: Curculionidae), is an invasive pest of canola (Brassica napus L. and Brassica rapa L.) in western Canada. Under current climatic conditions, C. obstrictus is spreading from established populations in southwestern Alberta at ≈55 km/yr. We studied the influence of climatic conditions on C. obstrictus flight behavior in 2007 and 2008 and eastward dispersal from the western border of Saskatchewan from 2002 to 2007. Positive linear relationships between increases in mean temperature and flight height and between greater mean maximum temperature and expanded dispersal distances were significant. Increases in relative humidity were associated with reduced flight heights and dispersal distances. We developed models that predict the relationships of temperature and relative humidity with flight height and with dispersal distance. We also discuss implications for C. obstrictus dispersal under current climatic conditions and in the context of predicted climate change.

© 2010 Entomological Society of America
James A. Tansey, Lloyd M. Dosdall, Andrew Keddie, and Owen Olfert "Flight Activity and Dispersal of the Cabbage Seedpod Weevil (Coleoptera: Curculionidae) are Related to Atmospheric Conditions," Environmental Entomology 39(4), 1092-1100, (1 August 2010). https://doi.org/10.1603/EN10026
Received: 27 January 2010; Accepted: 13 April 2010; Published: 1 August 2010
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KEYWORDS
climate change
dispersal
invasive species
relative humidity
temperature
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