The regional monitoring program is being conducted in berry and stone fruit crops 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 11, 2020.
Traps were removed from sites in Elgin, Norfolk, Halton and Oxford and from harvested crops in other counties last week. The table below summarizes the crops in which traps were monitored August 5-11, 2020.
The graph below shows the average number of SWD per trap in the counties where monitoring has been done this growing season. SWD numbers are still elevated in Kent and are continuing to increase in Niagara and Northumberland. The drop in counts in Essex and Durham is likely due to the end of clean harvest of berry crops.
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 and be aware of pre-harvest intervals.
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.