Female spotted wing drosophila showing serrated ovipositor that allows eggs to be laid through the skin of intact fruit
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Spotted Wing Drosophila Update, Aug 7, 2020

Spotted wing drosophila trap catches on the rise in Ontario with milder temperatures and ripening fruit

The regional monitoring program is being conducted in berry and stone fruit crops and starting in grapes in Essex, Chatham-Kent, Elgin, Norfolk, Halton, Oxford, Niagara, Durham and Northumberland counties.  This post provides average trap counts for all the monitored counties up to August 5, 2020. 

The table below summarizes the crops in which SWD have been monitored in each county.

The more moderate temperatures allowed SWD numbers to increase across the province. Many berry and all cherry sites are post-harvest leading to higher trap catch. Monitoring is shifting from post-harvest crops into ripening stone fruit and grape blocks after this week. 

Use these results in addition to your own monitoring program to determine when SWD is present on your farm.  Growers with ripening crops susceptible to SWD should consider using a product with activity against SWD in preharvest sprays.  Conduct a salt water test or a plastic baggie test to confirm presence of larvae in fruit.  Check the SWD product registrations on ONFRUIT at SWD Registrations 2020 – ONfruit.

The monitoring project is funded by Niagara Peninsula Fruit and Vegetable Growers Association, Ontario Grape and Wine Research and Ontario Tender Fruit Growers in collaboration with private consultants.

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