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Spatial distribution of spotted-wing drosophila (Diptera: Drosophilidae) and other insects in fruit of a sweet cherry (Rosaceae) orchard

Published online by Cambridge University Press:  22 June 2020

Amanda C. Chamberlain ,
Robert Lalonde Open the ORCID record for Robert Lalonde [Opens in a new window]  and
Howard M.A. Thistlewood Open the ORCID record for Howard M.A. Thistlewood [Opens in a new window]
Amanda C. Chamberlain
Affiliation:
Department of Biology, University of British Columbia Okanagan, 1177 Research Road, Kelowna, British Columbia, V1V 1V7, Canada
Robert Lalonde
Affiliation:
Department of Biology, University of British Columbia Okanagan, 1177 Research Road, Kelowna, British Columbia, V1V 1V7, Canada
Howard M.A. Thistlewood*
Affiliation:
Department of Biology, University of British Columbia Okanagan, 1177 Research Road, Kelowna, British Columbia, V1V 1V7, Canada Agriculture and Agri-Food Canada, Summerland Research and Development Centre, P.O. Box 5000, 4200 Highway 97 N, Summerland, British Columbia, V0H 1Z0, Canada
*
*Corresponding author: Email: Howard.Thistlewood@canada.ca
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Abstract

Spotted-wing drosophila, Drosophila suzukii (Matsumura) (Diptera: Drosophilidae), is an invasive pest of many small and soft fruits. We present the first results concerning its oviposition in the canopy of a sweet cherry (Prunus avium Linnaeus; Rosaceae) orchard. We examined the distribution of arthropods emerging from fruits of five cultivars ripening successively over seven weeks, in interior and border rows, within four regions of the tree canopy (top/bottom height × north/south aspect), and measured the associated fruit ripeness (ºBrix). Single fruits were reared for more than two weeks: 1328 arthropods emerged from 887 cherries in June, and 10 426 emerged from 1071 cherries in July. When populations were low, significantly more D. suzukii were present in the northernmost row and northern canopy aspect. Later, its distribution with respect to cherry row, height, and aspect was homogenous. Drosophila suzukii density per sweet cherry was highest in the latest ripening cultivar, when its distribution was not homogeneous; significantly more D. suzukii were in the centre than the southernmost row, in the lower canopy, and the southern aspect, than elsewhere. In the early season, single egg clutches were found without aggregation. As population density increased, so did intraspecific aggregation, but D. suzukii did not co-exist with other Drosophila Fallén species, nor with Rhagoletis indifferens Curran (Diptera: Tephritidae) when present.

Type
Research Papers
Information
The Canadian Entomologist , Volume 152 , Issue 4: The spotted-wing drosophila , August 2020 , pp. 450 - 473
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Copyright
© Crown Copyright and The Author(s), 2020. Published by Cambridge University Press on behalf of the Entomological Society of Canada

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Footnotes

Subject editor: Chandra Moffat

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