Danish pollen beetles – resistance populations and their egg production

PhD defence, Thursday 29 June 2017, Caroline Kaiser

2017.06.29 | Helle Karvonen

Caroline Kaiser

The pollen beetle is a serious pest in oilseed rape. Resistance to commonly used pyrethroid insecticides has been troublesome in European agriculture. This PhD thesis established toxicological baselines of pyrethroid and neonicotinoid insecticides for Danish pollen beetles. The most pyrethroid susceptible pollen beetle populations were found in western Jutland whereas populations from Zealand showed high pyrethroid resistance levels. The majority of pollen beetles tested was susceptible to neonicotinoid thiacloprid. Besides the toxicological investigations, biological key parameters such as egg production, weight, and feeding damage were analysed. The importance for sex-specific biological and molecular studies of pest species was highlighted, and a novel method has been developed for life-stage specific vitellogenin expression of females. The insecticide resistance mechanisms in pollen beetles were investigated with molecular methods as well. These research findings contribute to the understanding of insecticide resistance and biology in pollen beetle populations and will contribute to future resistance risk assessments and pest management programmes.


The PhD degree was completed at Department of Agroecology, Science and Technology, Aarhus University.

This résumé was prepared by the PhD student.

Time: 29.06.2017, 13:00
Place: Auditorium, Department of Agroecology, Aarhus University, Flakkebjerg, Forsøgsvej 1, DK-4200 Slagelse
Title of Dissertation: Pyrethroid resistance and neonicotinoid susceptibility of pollen beetles (Meligethes aeneus F.) and their biological key parameters
Contact information: Caroline Kaiser, caroline.kaiser@agro.au.dk,
Members of the assessment committee:
Professor Nina Cedergreen, Department of Plant and Environmental Sciences, University of Copenhagen, Denmark
Professor Heikki Hokkanen, Department of Agricultural Sciences, University of Helsinki, Finland
Senior Scientist Henrik Skovgård (chair), Department of Agroecology, Science and Technology, Aarhus University, Denmark
Main supervisor: Associate Professor Michael Kristensen, Department of Agroecology, Aarhus University
Co-supervisor: Senior Scientist Karl-Martin Vagn Jensen, Department of Agroecology, Aarhus University
Language: The PhD dissertation will be defended in English.

The defence is public.
The dissertation is available for reading at the Graduate School of Science and Technology/GSST, Ny Munkegade 120, building 1520, room 128-134, 8000 Aarhus C.

PhD defence
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Revised 23.02.2018