This post contains a summary of trap counts for Aug 121-29, 2019. The numbers reported are number of SWD per trap.
The regional monitoring program is being conducted in berry and stone fruit crops and grapes in Essex, Chatham-Kent, Norfolk, Niagara and Durham counties
The monitoring project is supported by a grant from the Canada Adaptation Program and collaboration among Niagara Peninsula Fruit and Vegetable Growers Association, Ontario Tender Fruit Growers, Eastern Ontario Berry Growers, Grape Growers of Ontario, OMAFRA staff and private consultants.
Traps were first deployed in berry and stone fruit blocks and have now progressed into table and wine grapes. 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. Click here for instructions on doing this test.
|County||Crop||Crop stage||Number of SWD per trap|
|Aug 7-14||Aug 14-21||Aug 21-29|
|Essex||Field raspberry||42F, 38M||54F, 28M||retired|
|Peach||89F, 21M||62F, 12M||retired|
|Wild||547F, 265M||35F, 31M||retired|
|Plum||43F, 18M||76F, 17M||retired|
|Kent||Blueberry||harvest||15F, 12M||2F, 1M||66F, 89M|
|Strawberry||ripe||4F, 16M||1M||3F, 7M|
|Raspberry||post harvest||16F, 20M||6F, 7M||72F, 29M|
|Norfolk||Wild raspberry||15F, 17M||94F, 51M||retired|
|Blueberry||67F, 34M||55F, 15M||retired|
|Blueberry||36F, 10M||82F, 24M||retired|
|Blueberry||34F, 14M||112F, 19M||retired|
|Niagara||Strawberry||ripe||12F, 5M||12F, 8M||25F, 14M|
|Wild||n/a||58F, 18M||10F, 28M||2F, 1M|
|Currant||harvest||49F, 65M||25F, 31M||61F, 58M|
|Blackberry||ripe||124F, 67M||41F, 8M||72F, 60M|
|Niagara||Apricot||ripe||49F, 15M||37F, 14M||52F, 50M|
|Plum||ripe||98F, 25M||26F, 10M||38F, 47M|
|Nectarine||ripe||17F, 21M||6F, 2M||26F, 18M|
|Peach||ripe||25F, 7M||39F, 9M||10F, 8M|
|Niagara||Peach||ripe||30F, 84M||13F, 31M||56F, 53M|
|Peach||ripe||69F, 217M||17F, 46M||75F, 30M|
|peach||turning colour||33F, 44M||26F, 21M||28F, 7M|
|peach||turning colour||53F, 32M||26F, 24M||40F, 34M|
|Niagara||nectarine||harvest||5F, 4M||3F, 6M||12F, 28M|
|peach||ripe||2F, 2M||2F, 6M||13F, 16M|
|peach||18F, 18M||5F, 7M||retired|
|table grape||ripe||24F, 17M|
|wine grape||veraison||6F, 7M|
|wine grape||veraison||4F, 14M|
|wine grape||veraison||25F, 24M|
|wine grape||veraison||14F, 12M|
|table grape||ripe||40F, 38M|
|wine grape||veraison||18F, 22M|
|Durham||wild||7F, 26M||48F, 143 M||retired|
|Blueberry||21F, 13M||86F, 52M||retired|
|Blueberry||8F, 3M||58F, 64M||retired|
|Blueberry||18F, 10M||19F, 12M||retired|
Once sustained catch occurs (two weeks in a row with SWD) growers with ripening crops susceptible to SWD in that region should consider using a product with activity against SWD in preharvest sprays.
SWD may have an impact on sour rot development as it can carry the bacteria and yeasts responsible for the disease (as can the everyday run-of-the-mill Drosophila species). Therefore it is recommended that once fruit is over 12 Brix, any product selected for managing preharvest grape berry moth should also have activity against SWD. This topic was covered in a previous blog post: https://onfruit.ca/2018/09/11/spotted-wing-drosophila-swd-a-problem-for-ontario-grapes/
Check the SWD product registrations on our website.
We are currently testing susceptibility of peach varieties to damage by SWD. Fruit collected at pre-commercial ripeness, commercial ripeness and tree ripe are being exposed to SWD under lab conditions. Fruit firmness is measured to classify into the 3 ripeness classes. Fruit are exposed to SWD for 24 hours and then incubated to allow any SWD to mature to adults. This will be continued into peaches and grapes. According to David Jones, MSU extension expert, “For plums and peaches, you shouldn’t be starting management the moment that color creeps in,” he said. “If you initiate a spray program around 4 to 5 pounds of firmness, you should be able to catch them.” Source: https://www.goodfruit.com/new-mindset-for-managing-spotted-wing-depredation/ Our preliminary trial on apricot last year supported this observation.
This project was funded in part through the Canadian Agricultural Partnership (the Partnership), a federal-provincial-territorial initiative. The Agricultural Adaptation Council assists in the delivery of the Partnership in Ontario.