Blowfly (Diptera,Calliphoridae) damage on stockfish in northern Norway: pest species,damage assessment and the potential of mass trapping |
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Authors: | Anders Aak Tone Birkemoe Reidar Mehl |
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Institution: | (1) Department of Pest Control, Norwegian Institute of Public Health, P.O. Box 4404, 0403 Oslo, Norway;(2) Institute of Microbiology, Armed Forces Medical Services, P.O. Box 4302, Nydalen, 0403 Oslo, Norway |
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Abstract: | Production of high quality stockfish in northern Norway takes place from February to May. The dominant blowfly species (Diptera:
Calliphoridae) with adults present during stockfish production were Calliphora vicina and Protophormia terraenovae. Larval collections identified the damage-causing species to be C. vicina. Other saprophagous blowfly species were only found after the production period. Fish dried in sun-exposed locations experienced
more damage than fish in shaded locations, and the risk of damage was higher in fish dried later in the production period.
Yellow sticky traps and funnel traps baited with dimethyl trisulphide were tested for their potential in mass trapping. Sticky
traps caught flies during early spring, while funnel traps increased in efficiency closer to summer. Attraction to dimethyl
trisulphide was found to be significantly higher for C. vicina compared to P. terraenovae, and the catch of C. vicina consisted of 92% females. The catch of female flies during the critical drying period consisted of 5–30% of the estimated
number of flies having caused damage. The target specificity with high female catches and the cost efficiency of these traps
indicate that mass trapping can be used as an integrated part of a management program to reduce damage from blowflies in stockfish
producing areas. |
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