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The effects of soil and plant nutrients on the oviposition preference, larval performance and spatial dynamics of Ceutorhynchus obstrictus and its parasitoids Open Access


Other title
Ceutorhynchus obstrictus
Brassica napus
cabbage seedpod weevil
pest management
plant stress hypothesis
plant vigor hypothesis
preference-performance hypothesis
Type of item
Degree grantor
University of Alberta
Author or creator
Blake, Adam J.
Supervisor and department
Keddie, B. Andrew (Biological Sciences)
Dosdall, Lloyd M. (Agricultural, Food and Nutritional Science)
Examining committee member and department
Cahill, James F. (Biological Sciences)
Cárcamo, Héctor A. (Agriculture and Agri-Food Canada)
Department of Biological Sciences

Date accepted
Graduation date
Master of Science
Degree level
The effects of nitrogen and sulfur fertilization on the oviposition, feeding preferences, and larval performance of Ceutorhynchus obstrictus (Marsham) (Coleoptera: Curculionidae) on Brassica napus L. were examined in a series of laboratory experiments. The associations between C. obstrictus adults, larvae and parasitoids, and environmental factors including plant vigor indicators and soil and plant nutrients were evaluated within two commercial fields of B. napus in southern Alberta. Nitrogen fertilization, and sulfur fertilization at low levels of nitrogen fertilization had positive effects on oviposition preference. Nitrogen had a positive effect on larval development times and no effect on larval weights. Within one field, gravid C. obstrictus females were dissociated with high levels of plant nutrients including nitrogen. The synthesis of the lab and field experiments seems to support the plant stress and the preference-performance hypotheses. Differences in olfactory and visual cues are identified as a possible mechanism for the observed differences.
License granted by Adam Blake ( on 2010-09-29T03:32:58Z (GMT): Permission is hereby granted to the University of Alberta Libraries to reproduce single copies of this thesis and to lend or sell such copies for private, scholarly or scientific research purposes only. Where the thesis is converted to, or otherwise made available in digital form, the University of Alberta will advise potential users of the thesis of the above terms. The author reserves all other publication and other rights in association with the copyright in the thesis, and except as herein provided, neither the thesis nor any substantial portion thereof may be printed or otherwise reproduced in any material form whatsoever without the author's prior written permission.
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