Update- Spotted Wing Drosophila Update, July 13, 2018

This year we are conducting a regional monitoring program in berry and stone fruit crops and grapes including Essex, Chatham-Kent, Elgin, Norfolk, Wellington, Niagara, Durham, Ottawa/Carleton, Stormont, Dundas and Glengary (SDG) and Northumberland counties.  This post contains a summary of trap counts since May 28, 2018, updated July 13.  The chart will be updated weekly.

Trapping was initiated in berry fields and will progress into stone fruit (tart cherry, sweet cherry, yellow plum, apricot, peach, nectarine, blue plum) and grape crops as they ripen.  We have placed 4 traps with commercial SWD lures at each site.  Use these results in addition to your own monitoring program to determine when SWD is present on your farm. Conduct a salt water test or a plastic baggie test to confirm presence of larvae in fruit.

The monitoring project is a collaboration among the Niagara Peninsula Fruit and Vegetable Growers, Ontario Tender Fruit Growers, the Eastern Ontario Berry Growers, OMAFRA staff and private consultants.

SWD has been identified in traps in Northumberland, Essex, Chatham-Kent, Elgin, Niagara, Wellington, Durham and Norfolk counties as of July 16. Numbers are starting to increase- note the wild host catches in Elgin County.  This means that growers with ripening crops susceptible to SWD should consider using a product with activity against swd in preharvest sprays.  Check the SWD product registrations on our website. Mako and Malathion have received emergency use registration for this year again and previous blog posts for information on products for managing pre-harvest insects including swd on stone fruit.

Week Traps Collected # sites with SWD/ # sites checked # SWD trapped in 4 traps per site Counties where SWD was found Crops where SWD was trapped
May 28-June 3 0/7 0
June 4-June 10 1/7 1 female Norfolk Tart cherry
June 11-June 17 1/9 1 male Norfolk Tart cherry
June 18-June 24 0/10 0
June 25-June 29 4/16 1 male Essex Raspberry
    1 male Chatham-Kent Sweet cherry
    1 male Durham Blueberry
    1 female Norfolk Tart cherry
June 30-July 6 9/18 1 female Essex Gh raspberry
    8 female (3,3,2)*       2 male (1,1)* Chatham-Kent Tart cherry
    2 female, 1 male Chatham-Kent Sweet cherry
    4 female (3,1)* Norfolk Tart cherry
    1 male Norfolk Blueberry
    1 female, 1 male Norfolk Cherry
    1 female Niagara Tart cherry
    1 female Niagara Sweet cherry
    1 female Niagara Sweet cherry
July 7-July 13 9/18 7 female, 3 male Essex GH raspberry
24 female (1,21,2)*, 47 male (4, 43, 0)* Elgin Strawberry and wild raspberry (21 female, 43 male in wild raspberry)
3 female (2,1)* Norfolk Wild raspberry (2), tart cherry
49 female (17,10,10,12)*, 28 male (9,6,7,6)* Norfolk Tart cherry, wild brambles, wild raspberry
1 female, 1 male Niagara Strawberry, blueberry
3 female (1,1,1)*, 1 male Niagara Wild raspberry, field raspberry, tart cherry
2 female (1,1)* Niagara Tart cherry
2 female, 1 male Wellington Raspberry
7 female (6,1)*, 2 male (1,1)* Northumberland Wild raspberry, field raspberry

*number of flies per trap

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