Sustained SWD catch in Eastern NY — Columbia County5 SWD, Clinton County5 SWD, & Orange County36 SWD — and Wayne County 4 SWD. Berries and cherries are being harvested and will continue ripening over the next several weeks. Risk from SWD infestation will be high from this point forward in the growing season.
Pay attention to SWD -- look for symptoms of leaky fruit; flat, sunken, & dull spots or dimples on the fruit surfaces; or distorted & disintegrating fruit. Protect ripe and ripening fruit crops from infestation with an insecticide program.
Yikes! After catching nothing last week... First catch had 26 SWD caught in four traps set in a blueberry planting in Tioga County — 15 females and 11 males. These traps are being monitored by Barb Neal, CCE of Tioga County and Shona Ort, CCE of Chemung County.
I'd say it's time to protect the crop at this location! We want to bring in a good crop and protect it. For comprehensive information on protecting blueberries from SWD, download and read the new IPM guide from the SWD IPM Working Group.
A single female SWD was caught in a blueberry planting in Orleans County, in traps checked on July 9, 2019by Liz Tee, Lake Ontario Fruit Program of CCE. While the number is low, it is likely that the SWD catch will be greater next week, but possibly not.
That's one of the things that makes this insect so unnerving — it can explode when you least expect it.
Make sure you keep an eye on how ripe your crop is. No-choice lab tests proved SWD females can lay eggs in blueberries that are pink.
Take the time to carefully plan out your management strategy now. Review resources available online to help you learn how to protect ripe and ripening fruit crops from infestation.
SWD management - has the insecticide quick guides and summaries of cultural tactics
SWD monitoring - has the info on salt flotation to check fruit for infestation
Crops of concern - gives you a perspective on all the various fruit and wild plants that can serve as hosts for SWD
First catch was obtained on July 8, 2019 in Herkimer County. Nine SWD — 3 females and 6 males, distributed both within and on the edge of the planting. Numbers of SWD being caught are starting to escalate.
It's time to get an insecticide program geared up for ripening and ripe fruit. This season will be demanding and all tactics should be brought to bear on SWD to keep it in check!
One female SWD was caught in two traps placed in a small raspberry patch in Livingston County. Traps were checked on July 3, 2019 by Dave Thorp, CCE Association of Livingston County.
Only four counties in the network, two added just last month, have not yet caught SWD — Herkimer, Onondaga, Orleans, and Tioga. All these counties have traps set in blueberry fields. In Orleans a second site has traps set in raspberry.
32 SWD were caught in four traps set on the edge of and within a tart cherry orchard in Columbia County. Fruit is ripe in the orchard. These traps, checked on July 1, 2019, are being monitored by Natasha Field, Cornell Cooperative Extension Eastern NY Commercial Horticulture Program.
Numbers caught in traps, especially in Eastern NY, are climbing, with totals in the double and triple digits. Typically, we don’t see numbers climb up this rapidly in the SWD trap monitoring network. Fruit that is ripe is at risk of infestation. Consult Cornell Fruit Resources SWD Management, fruit.cornell.edu/spottedwing/management/.
Things to consider regarding insecticide programs for SWD, with specific emphasis on materials registered for cherries:
Population growth models for SWD theoretically calculate that using the most efficacious insecticide first will more successfully lower SWD numbers by knocking the population back to close to zero and delaying population growth. (This is strikingly similar to classic tactics in plant disease epidemiology – think knocking back primary apple scab infections.)
Insecticides with probable excellent efficacy include – Exirel (3 days), Minecto Pro (21 days), Danitol 2.4EC (3 days), Mustang Maxx (14 days), and Imidan 70W (7 days). Of these, choose first those with the longest pre-harvest interval (given in parentheses) that you can accommodate; some may be out of the question at this point. (Remember – Imidan can’t be used on sweet cherry.) Rotate to other insecticides with shorter pre-harvest interval for later in the season, closer to harvest.
Research on berries has shown Mustang Maxx isn’t very rain fast, so plan to re-cover if significant rain occurs during the spray interval.
Rotate use among insecticides with different IRAC groups to reduce selection pressure for resistant populations of SWD. (In a Finger Lakes vineyard last year, insecticide-resistant Drosophila melanogaster (SWD = D. suzukii) were identified. D. melanogaster is targeted with insecticide for controlling sour rot in grapes.)
For the second insecticide application, switch to a product with Good to Excellent or Moderate efficacy – Entrust 80WP (7 days), Entrust 2SC (7 days), Delegate (7 days), Asana XL (14 days), Lambda-Cy EC (14 days).
The spray interval column in the Insecticide Quick Reference Guide table relates to use of the same product back-to-back. When switching to another mode of action, weekly applications are OK and are suggested against SWD.
Don’t stretch intervals between sprays more than about seven days.
Make sure you are getting excellent coverage. Spray every row (no alternate row spraying.)
Sustained SWD catch in Eastern NY with some site totals in the double to triple digits — the Capital District, Mohawk Valley, and Champlain Valley. Berries are being harvested and will continue ripening over the next several weeks. This will create an SWD paradise for fruit infestation.
Washington: 6/24/2019, 4 females, blueberry – total 4
Re-set raspberry and blackberry fields: Because raspberry and blackberry continue to flower and set fruit over a protracted period of time, it is possible and advisable to “re-set” the field. When fruit infestation is found via salt flotation or high numbers of SWD are caught in traps in the field, clean pick all ripe and cull fruit. Remove this fruit from the planting and solarize it or freeze it to kill SWD. Solarize in sealed, clear plastic bags set in the sun. After clean picking, spray insecticide. Choose a material with excellent efficacy against SWD and an appropriate days-to-harvest interval.
Three female SWD were caught in traps set on the edge of and within a blueberry planting in Clinton County. These traps, checked on July 2, 2019, are being monitored by Andy Galimberti, Cornell Cooperative Extension Eastern NY Commercial Horticulture Program.
About 85% of the counties in the CCE SWD Monitoring Network have caught SWD in traps. Two more counties have been added to the network in recent weeks – Herkimer and Tioga.
Numbers caught in traps, especially in Eastern NY are starting to climb, with totals in the double and triple digits. Fruit is ripe and will continue ripening over the next several weeks and be at risk of infestation.
SWD population growth models theoretically calculate that using the most efficacious insecticide first will more efficiently lower SWD numbers by knocking the population back to close to zero and delaying population growth.
Review the Quick Guide to SWD Insecticides online at:
For two weeks in a row, June 25 (2 males and 1 female) and July 2, 2019 (1 female and 1 male), SWD has been caught in raspberry in Niagara County. Traps are being monitored by Liz Tee, Cornell Cooperative Extension Lake Ontario Commercial Fruit Program.
Once SWD is found on the farm and fruit are ripe, protect the crop with insecticide sprays. Refer to the quick reference guides for: