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ARS Home » Pacific West Area » Corvallis, Oregon » Horticultural Crops Research Unit » Research » Publications at this Location » Publication #305532
Title: Distribution and activity of Drosophila suzukii in cultivated raspberry and surrounding vegetation

Author
item KLICK, JIMMY - Oregon State University
item YANG, WEI - Oregon State University
item WALTON, VAUGHN - Oregon State University
item DALTON, DANIEL - Oregon State University
item Hagler, James
item DREVES, AMY - Oregon State University
item Lee, Jana
item BRUCK, DENNY - Pioneer Hi-Bred, Inc

Submitted to: Journal of Applied Entomology
Publication Type: Peer Reviewed Journal
Publication Acceptance Date: 4/5/2015
Publication Date: 2/1/2016
Citation: Klick, J., Yang, W., Walton, V., Dalton, D., Hagler, J.R., Dreves, A., Lee, J.C., Bruck, D. 2016. Distribution and activity of Drosophila suzukii in cultivated raspberry and surrounding vegetation. Journal of Applied Entomology. 140:37-46. doi: 10.1111/jen.12234.

Interpretive Summary: Spotted wing drosophila develops on wild Himalayan blackberry. It is suspected of invading berry and stone fruit crops from adjacent field margins that may have wild blackberry or other non-crop host plants present. Our study determined the role of field margins containing Himalayan blackberry on the movement, density, and distribution of spotted wing drosophila in adjacent red raspberry fields. There were three plots with Himalayan blackberry borders adjacent to raspberry, and three plots with wheat (2011) or grass seed (2012) which is non-host vegetation adjacent to raspberry. Filed margins were marked with an egg white protein, and flies were collected in the margins and crop area and tested for the presence of the mark. More flies were collected in Himalayan field margins than non-host margins, and almost no marked flies were found adjacent to non-host margins. Flies were also aggregated in the raspberry field near they Himalayan blackberry.

Technical Abstract: Spotted wing drosophila, Drosophila suzukii Matsumura (Diptera: Drosophilidae), readily utilizes wild ‘Himalaya’ blackberry (HB) Rubus armeniacus Focke, as a refuge, among other non-crop host plants, and is suspected of invading berry and stone fruit crops from adjacent field margins. Studies were conducted to determine the role of field margins containing HB and their effect on D. suzukii movement, density, and distribution in an adjacent red raspberry field. One ha plots adjacent to field margins containing HB or non-hosts (NH) (wheat in 2011; grass seed in 2012) were replicated 3 times. Each plot contained two transects with D. suzukii traps in the field margin (0 m) and spaced approximately 10 (crop boundary), 40, 70 and 100 m into the adjacent crop (n=10 traps/plot). Field margin vegetation was treated weekly from pre-harvest through harvest with a 10% chicken egg white mark solution using a cannon sprayer. Adult D. suzukii were collected from traps weekly and analyzed for the presence of the egg white mark using an egg white-specific enzyme-linked immunosorbent assay (ELISA). During both years, significantly more marked flies were collected in HB field margins and virtually no marked flies were found in situations where adjacent vegetation contained no known alternate host. Spatial Analysis by Distance IndicEs (SADIE) and mean D. suzukii trap captures additionally display patches of elevated fly densities in the raspberry field near HB. These results indicate that HB contribute to elevated D. suzukii populations and pest pressure as opposed to field margins containing no known D. suzukii host vegetation. Other non-crop host plants may contribute towards a favorable field margin for D. suzukii but this work indicates the importance of surrounding vegetation when considering pest management options.