Flight behaviour of the cabbage seedpod weevil |
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Authors: | C. Kjæ r-Pedersen |
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Affiliation: | (1) Institute of Zoology and Zoophysiology, Zoological Laboratory University of Aarhus, Building 135, DK-8000 Aarhus C, Denmark;(2) Present address: Division of Terrestrial Ecology, National Environmental Research Institute, Vejlsøvej 25, DK-8600 Silkeborg, Denmark |
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Abstract: | The influence of host odour, windspeed, position of the sun, and temperature on flight behaviour of the cabbage seedpod weevil (Ceutorhynchus assimilis Paykull) were studied. This weevil showed a positive anemotaxis (upwind flight) inside the odour plume of a host crop (Brassica napus L.). Outside the odour plume the weevil showed a pronounced phototaxis at windspeeds below 1.5 m/s. At higher windspeeds, the seedpod weevils flew downwind. The cabbage seedpod weevil flies most readily at low windspeeds (less than 0.5 m/s) and at temperatures above 22 °C. |
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Keywords: | Ceutorhynchus assimilis host finding phototaxis anemotaxis flight activity field cage experiments |
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