Spotted Wing Drosophila (SWD) Update: July 28th. SWD Adults in Dutchess County

SWD Red Solo Cup Trap. Image UNH
SWD Red Solo Cup Trap. Image UNH Cooperative Extension
The ENY Horticultural Team reported two male spotted wing Drosophila (SWD) captured in an apple cider vinegar trap in a raspberry patch in Dutchess County (Poughkeepsie) on July 28th. Fall raspberry were too few in number and immature for damage assessment (3 raspberries showed no damage) while nearby blueberry samples showed no egg laying injury.

To date, SWD have been captured in the Hudson Valley counties of Westcester, Dutchess and Ulster in raspberry, blueberry and blackberry plantings. Given the increasing number of SWD finds we are seeing in the northeast, it would be wise to begin trapping efforts in brambles and blueberry fields as flies increase from localized to regional populations. Although very little damage has occurred in Hudson Valley fruit, It is likely that SWD damage to small fruit will begin over the upcoming week as adults establish and build in populations in berry patches.

Spotted Wing Drosophila, Drosophila suzukii (SWD) is a vinegar fly native to East Asia. Established in the Eastern US since 2012, it has become an invasive insect pest of small fruit and to a lesser degree, cherry and grape. Information on insect biology.
Traps we are presently using are made of red plastic 16 oz. solo cups and lids with a black band of electrical tape. Traps are baited with apple cider vinegar (ACV), as the attractant killing solution. Approximately 30, 1/8″ holes, are drilled around the top 3/4 of the cup, leaving a 3′ gap to pour out the ACV solution in a strip of 2″ x 2″ netting to access the number of captured flies. A yeast, flour & sugar bait mixed with water is added to a 5 oz. fixed position cup along the top edge.

The Cornell Spotted Wing Drosophila web site hosts a map of the counties in which SWD is being trapped. Updates on presence based on trap findings can be found here.

Conventional and Organic Management Options:
Insecticides labeled in NYS to manage SWD

SWD Identification using key characteristics.
SWD Identification using key characteristics.

About Peter J Jentsch

Peter J. Jentsch serves the mid-Hudson Valley pome fruit, grape and vegetable growers as the Senior Extension Associate in the Department of Entomology for Cornell University’s Hudson Valley Laboratory located in Highland, NY. He provides regional farmers with information on insect related research conducted on the laboratory’s 20-acre research farm for use in commercial and organic fruit and vegetable production. Peter is a graduate of the University of Nebraska with a Masters degree in Entomology. He is presently focusing on invasive insect species, monitoring in the urban environment and commercial agricultural production systems throughout the state
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