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Spotted Wing Drosophila (SWD) Update: July 25th. SWD in Hudson Valley Raspberry and Blueberry

SWD Identification using key characteristics.

SWD Identification using key characteristics.

The ENY Horticultural Team reported a single male spotted wing Drosophila (SWD) captured in an apple cider vinegar trap in a blueberry patch in Ulster County on July 25th, and three SWD males confirmed from traps set in raspberries, checked the week ending July 18, 2014 in Westchester County by CCE.

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.

SWD Red Solo Cup Trap. Image UNH

SWD Red Solo Cup Trap. Image UNH Cooperative Extension

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.

To date we have not captured SWD in Orange, Dutchess or Columbia Counties trapping in raspberry and blackberry plantings. However, given the small yet 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. It is likely that SWD damage to small fruit will begin over a 1-2 week period once adults appear in berry patches.

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