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Tart cherry SWD update

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: http://blogs.cornell.edu/swd1/2018/07/10/swd-caught-in-traps-set-in-tart-cherry/

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.

 

 

Tonight! — SWD Field Meeting, Hudson Valley

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.

LOCATION:
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: https://enych.cce.cornell.edu/event.php?id=971
Or Call Abby Henderson at 518-746-2553

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

First find in Livingston County

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, fruit.cornell.edu/spottedwing/monitoring/ – describes what you can do.
  • SWD management, fruit.cornell.edu/spottedwing/management/ – describes what you should do.
  • SWD distribution, fruit.cornell.edu/spottedwing/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…

First catch in Wayne and Onondaga Counties

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

Sustained catch in Niagara County

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.

First find in Saratoga County

Male SWD on blackberry in August.

Two SWD females were caught in one out of four traps set in a blackberry planting in Saratoga County during the week ending July 11, 2018. The trap that caught SWD was on the edge of the planting. These traps are being monitored by Natasha Field and Laura McDermott, Eastern NY Commercial Horticulture Program.

Keep an eye on your crop and monitor for SWD!  More information on the SWD Monitoring page.

Protect your crop and use all possible tactics to manage SWD!  More information on the SWD Management page.

First find in Washington County

SWD female showing the characteristic saw-tooth ovipositor in the inset, upper left. Note the thin, dark, unbroken bands on the abdomen.

A single female was found in a trap set on the edge of a blueberry planting in Washington County during the week ending July 10, 2018. None of the three other traps caught any SWD. Natasha Field and Laura McDermott, Eastern NY Commercial Horticulture Program, are monitoring SWD at this location.

First find in Orleans County

A single female SWD was found in a trap set on the edge of a raspberry planting in Orleans County during the week ending July 10, 2018. The other tap set in the crop caught zero SWD. These traps are being monitored by Tess Grasswitz, Lake Ontario Fruit Program.

Clean harvests, removing overripe fruit, weed management, and mowing all help reduce favorable habitat for SWD. See details on the SWD Management page on Cornell Fruit Resources.

Tiny threads of the SWD egg breathing tubes indicate where an egg was laid in a raspberry.

You can monitor SWD in your fruit plantings using a simple, easy to make trap and bread dough lure. Instructions on how to make an SWD trap are available on the Cornell Fruit Resources SWD Monitoring web page. Check traps daily to minimize the number of fruit flies you will need to sort through to find SWD; and focus on identifying the males, because they’re easy to ID. You can also sample fruit and check it for larvae via salt flotation.

Sustained catch in Schuyler County

Eight SWD were caught in raspberry and 5 in blueberry in side-by-side plantings in Schuyler County during the week ending July 9, 2018. Traps set in raspberry had 1 male and 4 females. Traps on the edge of the raspberry planting had 3 females. Traps set in the blueberry field had 4 females and those on the edge of the crop had 1 female. These traps are being monitored by Ryan Parker and Juliet Carroll, NYS IPM Program.

Checking fruit for larva with salt flotation at a workshop on SWD.

These data suggest that both raspberries and blueberries are at risk of infestation. Monitoring on your own farm is warranted – using traps, sampling fruit with salt flotation, and examining fruit for signs of infestation. All these methods are described on the SWD Monitoring web page.

“Recatch” in Columbia County

Four female SWD were caught the week ending July 9, 2018 in a harvested sweet cherry orchard after two weeks of zero SWD catch. The two traps set within the orchard had 2 females in one and 1 female in the other. The two traps set on the edge of the orchard caught only 1 female SWD. These traps are being monitored by Natasha Field and Laura McDermott, Eastern NY Commercial Horticulture Program. Natasha will check traps next week to see if there is sustained catch.

As with June-bearing strawberry, SWD may use remnant sweet cherry fruit as a resource to feed on and reproduce in, allowing populations to build in the orchard and spill over onto nearby susceptible crops.

keep looking »

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