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Chemung County is hosting a Spotted Wing Drosophila Update and Discussion for Fruit Producers on Tuesday July 10th, 2018, from 9:30 to 11:00 am. This morning session is open to all interested fruit growers and will be held at the Waverly Village Hall, Meeting Room, at 32 Ithaca St, Waverly, NY 14892. Spread the word!

Cornell Cooperative Extension (CCE) of Chemung and Tioga Counties would like to cordially invite regional fruit producers to this meeting on the Spotted Wing Drosophila. Shona Ort, Agricultural Development Specialist, CCE of Chemung County, is organizing this event.


For questions and to register, please contact Shona Ort of CCE Chemung at 607-734-4453 ext 227 or sbo6@cornell.edu.


Male SWD on raspberry. Photo by Dave Handley, UMaine Extension, Highmoor Farm.

Dr. Julie Carroll, Fruit IPM Coordinator, New York State IPM Program, and Dr. Dara Stockton, Postdoctoral Research Associate in Dr. Greg Loeb's lab, Dept. of Entomology, will give an update on this pest and participate in a discussion with growers on what folks are currently doing to combat it.

Cost to attend is free of charge, but pre-registration is requested in order to ensure enough space, handouts, and refreshments.

Most counties reporting in the SWD network have zero SWD captures (gray color) as of June 6, 2018.

As of 6 June 2018, no new reports of SWD trap captures in raspberry or blueberry from across the network have come in. All the NYS IPM Program's traps checked so far this week in tart cherry had zero SWD, including the site that had two females last week. In a research site where we are monitoring 36 traps in 1.5 acres of raspberries, zero SWD have been caught. Very low populations of SWD and no sustained catch has occurred to date.

Above, on the right, is the latest New York State distribution map built from data entered by the SWD monitoring network participants.

Tart cherry fruit development as of June 4, 2018. Not susceptible to SWD oviposition and infestation at this stage.

June strawberry harvest will begin this week, but the low numbers of SWD caught to date indicate low to no risk to this crop, so far.

In the Finger Lakes, Central NY and Wayne County, raspberry are just beginning to bloom.

Blueberry fruit have set, but are still green and hard.

Tart cherry are also still hard and green.

Hard, green fruits aren't susceptible to SWD infestation and don't warrant insecticidal protection.

Two female SWD were caught in two traps, one in each trap, in a tart cherry block near Lake Ontario's shore in Wayne County during the week ending on May 31, 2018. This tart cherry block had significant SWD infestation in 2017. Fruit are still hard and green in this block and are not yet susceptible to SWD.

Five other farms we are monitoring in Wayne County and one in Ontario County had zero SWD caught.

Reviewing 2017 tart cherry spray records from several farms in the Lake Ontario region showed (1) spray intervals were long, between insecticides effective against SWD, as harvest approached; and (2) blocks with 14- to 30-day-long spray intervals that escaped SWD injury were harvested before SWD either arrived or had built to damaging population levels.

In Michigan tart cherries, where SWD has been problematic for several years, the tactics are to (1) monitor for SWD in the tart cherry orchard; (2) keep an eye on fruit ripening stage, blush signals susceptibility; (3) apply insecticide to protect susceptible fruit if SWD has been caught in the orchard.

In an effort to spare your spray bill, be mindful of the other insects you are targeting in your tart cherries and choose insecticides that will also prove effective against SWD. The SWD insecticide quick guide for stone fruit is available on Cornell Fruit Resources Spotted Wing Management page.

If you're targeting plum curculio, consider using Exirel, Asana, Imidan, or Minecto Pro. If you're targeting cherry fruit fly or black cherry fruit fly, consider using Delegate, Exirel, Asana, Imidan, or Minecto Pro. If you're targeting obliquebanded leafroller, consider Entrust, Delegate, Exirel, Danitol, or Minecto Pro.

Be aware that only a couple materials effective against SWD for tart cherry have short, 3-day, pre-harvest intervals: Exirel (only 3 applications per year) and Danitol (only 2 applications per year). Grandevo, a biological has zero days to harvest and has been shown to be a good rotational product with Entrust in organic systems against SWD in blueberry. Make sure you plan a spray program that will spare these crucial short pre-harvest interval materials for use as harvest approaches.

 

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