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After a very early first catch in late May, SWD has again been caught in Erie County. Re-catch occurred the week ending July 12, 2018, when two female SWD were caught, one each in traps on the edge of and within the blueberry planting. Seven SWD were caught the subsequent week, ending July 18, three females in the edge and three females and one male within the planting.

Traps at this location are being monitored by Sharon Bachman, Erie County Cornell Cooperative Extension.

Blueberries are ripe across the region and harvests are underway. Once again, it’s time to pay attention to SWD and protect ripe and ripening fruit crops from infestation.

SWD found in Dutchess County, as of the week ending on July 10, 2018, and sustained catch during the week ending July 17.  On July 10, four females and one male were found in the raspberry crop, and three females and two males were caught in the nearby hedgerow. On July 17, only 1 female was found in the traps set in the crop and one female in the hedgerow.

Female SWD, on left, has large ovipositor. Male SWD, on right, has a spot on each wing.

Interestingly, the number of SWD caught decreased significantly from the first week to the second week possibly indicating that effective management tactics were put into place at this location.

SWD needs to be managed in susceptible fruit — know if it's on your farm and know how to fight it!

The traps in Dutchess County are being monitored by Zayd Normand, summer intern, working with Peter Jentsch, Hudson Valley Research Laboratory.

A blueberry grower in Tioga County monitoring traps daily for male SWD in their planting caught 6 males in one day, July 21, 2018. No SWD were found in traps up to and including Friday, July 20th.

Homemade SWD trap. The red cup contains an apple cider vinegar drowning liquid and a specimen cup with a wheat dough bait. Traps are checked daily for males.

The two traps are set in the hedgerow adjacent to the blueberry field. To quote the grower,

"Spraying is going to be hard with wet weather for the rest of the week."

The blueberry grower is making their own traps, using whole wheat dough as the bait and apple cider vinegar as the drowning liquid. Instructions for these whole wheat dough traps are on the SWD Monitoring page.

Only two Counties reporting zero SWD trap catch (gray) - Herkimer and Orange - as of July 23, 2018.


Elsewhere, across the CCE SWD monitoring network, all locations have reported in. Only the sites in Orange County and in Herkimer County have yet to catch SWD. Dutchess and Erie Counties are now at sustained catch. Details of these findings will be reported in a separate blog.

Three SWD were caught in two traps set in and on the edge of a blueberry planting in Chemung County; 2 males and 1 female. These traps are being monitored by Shona Ort, Chemung County Cornell Cooperative Extension.

Blueberries are ripe at this location and an insecticide program will be put into place this week.

Quick Guide to Berry Insecticides for SWD

Two male SWD on a blueberry, in early September 2013. SWD populations typically build to very high levels in late summer.

Although the hot and dry weather has compressed fruit maturity such that early-, mid-, and late-season blueberries are ripening almost simultaneously, this weather will also keep SWD population growth somewhat suppressed. ...but don't count on the weather to protect your fruit. SWD populations will continue to build through early fall until reproductive diapause sets in around October.

Detailed information on spotted wing drosophila is on the Cornell Fruit Resources website at

A male spotted wing drosophila (SWD) on blueberry; another likely SWD is in the background.

SWD has now been caught two weeks in a row in Columbia, Livingston, Onondaga, Orleans, Saratoga, Washington, Wayne, and Wyoming Counties. It's time to pay attention to SWD and protect ripe and ripening fruit crops from infestation.

Details about each County's sustained catch:

  • Wyoming: 7/12/2018, 2 females & 2 males, strawberry & blueberry
  • Columbia: 7/16/2018, 4 females & 1 male, sweet & tart cherry
  • Washington: 7/16/2018, 2 females & 1 male, blueberry
  • Orleans: 7/17/2018, 5 females & 3 males, hedgerow by raspberry
  • Wayne: 7/17/2018, 3 females & 3 males, raspberry
  • Livingston: 7/18/2018, 1 female, blueberry
  • Onondaga: 7/18/2018, 1 female, blueberry
  • Saratoga: 7/19/2018, 2 females & 1 male, blackberry

Thank you for monitoring SWD in these Counties!

  • Don Gasiewicz, Wyoming County Cornell Cooperative Extension (CCE)
  • Natasha Field and Laura McDermott, CCE Eastern NY Commercial Horticulture Program (Columbia, Washington, Saratoga Counties)
  • Tess Grasswitz, CCE Lake Ontario Fruit Program (Orleans County)
  • David Thorp, Livingston County CCE
  • Nicole Mattoon, Ryan Parker and Juliet Carroll, CCE NYS IPM Program (Onondaga, Wayne Counties)

We have caught SWD at all but one of the seven tart cherry sites we are monitoring in Western NY, Wayne and Ontario Counties. Counts are still low and it is likely that the hot and dry weather, as well as insecticide protection, has held things in check. Weather has turned cooler and rains have brought needed water to crops – SWD will like this, too.

Our low numbers are in stark contrast to the high numbers of SWD being reported this week by Nikki Rothwell, Michigan State University, in traps set in Michigan tart cherry orchards.

NOTE: First trap catch of SWD signals it’s time for insecticide protection in tart cherries. And... most berry sites in the statewide SWD monitoring network are now at sustained catch!

Trap catch results for tart cherry sites close to Lake Ontario in Wayne County:

  • Two are at continuous catch – third week in a row.
  • One has had discontinuous catch – SWD caught three times, but with intervening weeks with zero catch.

Trap catch results for tart cherry sites inland in Wayne and Ontario Counties:

  • One is at sustained catch.
  • Two are at first catch.
  • One has had zero SWD catch to date.

Cherries are ripe and soft and harvests are getting underway. Orchards in Western NY that have been harvested or will be harvested soon should escape SWD infestation without significant insecticide expense. If harvest won’t occur for another week or more, insecticide protection on the crop needs to be maintained at 7-day intervals; immediately reapplying after rain wash off.

A 50-fruit sample was collected this week from all the orchard blocks in which we have traps and checked via salt flotation. One of the samples had evidence of SWD eggs, no larvae. All other samples had no SWD in them.

Here’s the blog link for the tart cherry SWD insecticide and SWD management info, which I posted last week:

If, after harvest, there is remnant fruit on the ground that might put nearby cherry orchards or berry plantings at risk, consider a single application of Asana XL (2ee) on the fruit remaining on the ground (see quick guide to insecticides for treating dropped fruit). Keep in mind that the dropped fruit would have insecticide residue on it, so any application to dropped fruit should be delayed to take advantage of that residual insecticide coverage.

Starting at 5:00 PM today, Thursday, July 19, 2018, a field meeting on Exclusion Netting & SWD Monitoring will be held. The meeting runs from 5:00pm to 7:00pm at the Poughkeepsie Farm Project.

Exclusion netting over high tunnel raspberries will protect them from SWD.

Attend the meeting to see and learn about an SWD exclusion netting trial in raspberries!

Peter Jentsch, entomologist with the Hudson Valley Research Lab, will discuss the exclusion netting trail taking place at the Poughkeepsie Farm Project.

Poughkeepsie Farm Project
51 Vassar Farm Lane
Poughkeepsie, NY 12603

More reasons to attend:

  • Peter Jentsch will discuss attract and kill baits in a U-Pick raspberry planting.
  • Bring a berry sample and have it tested for SWD via salt flotation.
  • Have a conundrum? — bring a plant sample and ask the ENYCHP Cornell Cooperative Extension experts.
  • View low tunnels over strawberries to extend the season and protect them from rain.
  • Attendees can enter for a chance to win free SWD monitoring traps!

This meeting is Free and Open to the public.
Please Register Online at:
Or Call Abby Henderson at 518-746-2553

Sponsored by:
Hudson Valley Research Lab & CCE Eastern New York Commercial Horticulture Program

One female SWD was caught in a trap set in a small blueberry patch in Livingston County during the week ending July 12, 2018. These traps are being monitored by Dave Thorp, Livingston County CCE, and Ryan Parker, NYS IPM, sorted through the catch to identify the SWD.

A recap:

  • SWD monitoring, – describes what you can do.
  • SWD management, – describes what you should do.
  • SWD distribution, – describes where the CCE network is finding it.

Remember, the short life cycle and 10+ generations per year will make for high pressure situations in a few weeks' time. Management, management, management...

SWD were caught in a raspberry planting in Wayne County and in two blueberry plantings, one each in Wayne and Onondaga Counties during the week ending July 10, 2018. Fruit is ripe and harvests are underway at these farms. These traps are being monitored by Ryan Parker and Nicole Mattoon, working with Juliet Carroll, NYS IPM Program.

SWD distribution map, as of July 13, 2018. Only two reporting counties in the network have yet to catch SWD.

In Wayne County:

  • In raspberry — 2 females were caught in a trap on the edge of the planting. The other three traps caught zero SWD.
  • In blueberry — 2 males and 1 female were caught, one male in a trap on the crop edge. The two other SWD were in the two traps set within the crop.

In Onondaga County:

  • In blueberry — 1 male was caught in one of the traps set on the edge of the planting. The other three traps caught zero SWD.

Spread the word to fellow farmers, extension colleagues, and home gardeners. Sanitation, clean picking, mowing, weed management, judicious irrigation without leakage, planning for improved canopy management via pruning next year, insecticide protection at 7-day intervals with rotation to different modes of action (IRAC group number), reapply after rain — these are some management tactics to put into place at this time.

  • SWD monitoring, - describes what you can do.
  • SWD management, - describes what you should do.
  • SWD distribution, - describes where the CCE network is finding it.

Meet and greet - male (right) and female (left) SWD - on a raspberry fruit.

11 SWD were caught during the week ending July 10, 2018 in two traps set in a raspberry planting in Niagara County, indicating sustained catch.  The trap set within the crop caught 2 females and 6 males and 3 females and zero males were found in the trap set in the nearby hedgerow.

This jump in numbers is what we've been bracing for. The time of SWD population explosion is here.

Your focus needs to be on two things - management and monitoring:

Traps at this location are being monitored by Tess Grasswitz, Lake Ontario Fruit Program.

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