This post contains a summary of trap counts for Aug 14-21, 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.  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.

CountyCropCrop stageNumber of SWD per trap
Aug 1-7Aug 7-14Aug 14-21
EssexField raspberryfall harvest10F, 3M42F, 38M54F, 28M
Peachharvest20F, 13M89F, 21M62F, 12M
Wildn/a165F, 113M547F, 265M35F, 31M
Plumgreen fruit48F, 27M43F, 18M76F, 17M
KentBlueberryharvest13F, 8M15F, 12M2F, 1M
Strawberryripe4F, 16M1M
Raspberrypost harvest16F, 20M6F, 7M
NorfolkWild raspberryn/a26F, 46M15F, 17M94F, 51M
Blueberryharvest194F, 92M67F, 34M55F, 15M
Blueberryharvest142F, 42M36F, 10M82F, 24M
Blueberryharvest70F, 35M34F, 14M112F, 19M
NiagaraStrawberryripe21F, 15M12F, 5M12F, 8M
Wildn/a20F, 50M58F, 18M10F, 28M
NiagaraWild42F, 44M40F, 23Mretired
Mulberry47F, 66M94F, 309Mretired
Raspberry169F, 59M63F, 62Mretired
NiagaraCurrantharvest115F, 53M49F, 65M25F, 31M
Blackberryripe31F, 30M124F, 67M41F, 8M
Raspberry60F, 26M46F, 83Mretired
NiagaraApricotripe29F, 25M49F, 15M37F, 14M
Plumripe22F, 6M98F, 25M26F, 10M
Nectarineripe29F, 22M17F, 21M6F, 2M
Peachripe24F, 9M25F, 7M39F, 9M
NiagaraPeachturning colour18F, 10M30F, 84M13F, 31M
Peachturning colour104F, 91M69F, 217M17F, 46M
NiagaraRaspberry66F, 55M55F, 88Mretired
Raspberry29F, 29M18F, 20Mretired
NiagaranectarineJanuary 11, 190071F, 49Mretired
nectarineMarch 8, 190016F, 14Mretired
peachturning colourMarch 9, 190033F, 44M26F, 21M
peachturning colourMarch 10, 190053F, 32M26F, 24M
NiagaranectarineripeMarch 11, 19005F, 4M3F, 6M
peachripeJanuary 20, 19002F, 2M2F, 6M
peachripeFebruary 1, 190018F, 18M5F, 7M
apricotMarch 12, 190012F, 32Mretired
Durhamwildn/aJanuary 18, 19007F, 26MMay 11, 1900
BlueberryharvestJanuary 18, 190021F, 13MMay 12, 1900
BlueberryharvestJanuary 18, 19008F, 3M58F, 64M
BlueberryharvestJanuary 18, 190018F, 10M19F, 12M

Once sustained catch occurs (two weeks in a row with SWD) 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.

We are currently testing susceptibility of apricots, plums and peaches to damage by SWD. Vineyards will be included as of August 21.  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. 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: Our preliminary trial on apricot last year supported this observation.  Most fruit harvested for shipping is about 5 pounds pressure.

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.





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