This post contains a summary of trap counts for July 25-Aug 1, 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, Elgin, Norfolk, Niagara, Durham, Ottawa/Carleton and Northumberland 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.  As crops are harvested, traps are “RETIRED” and monitoring discontinued.

CountyCropCrop stageNumber of SWD per trap
July 3-11July 11-17July 17-25July 25- August 1
EssexRaspberryharvest2F, 2M40F, 5M4F, 2M14F,4M
Peachharvest1F, 1M38F, 10M12F,7M0
Wildn/a5F, 0Mnot reported86F, 115M42F,10M
Plumgreen fruitnot reported30F, 16M10F, 1M2F, 1M
KentWild Hostn/a5F, 0Mnot reported28F, 39M5F, 5M
Raspberry2nd-3rd harvest51F, 8M3F3F8F, 2M
Blueberryripe03F, 1M4F, 6M0
Strawberry3rd harvest8F, 3M16F, 5M9F, 5M3F, 18M
ElginWild raspberry1F, 4M21F, 19Mnot reportedRETIRED
Strawberrynot reported20F, 1M37F, 6MRETIRED
NorfolkWild raspberryn/a3F7F, 7M16F, 19M18F, 23M
Blueberryharvest2F23F, 4M45F, 36M7F, 7M
Blueberryharvest3F, 1M4F, 3M35F, 17M62F, 4M
Blueberryharvest09F50F, 17M64F, 12M
NiagaraStrawberry3rd harvest01M3F11F, 14M
Wildn/a2F, 6M5F, 10M12F, 8M12F, 73M
Strawberryripe004F2F, 1M
Wildn/a05F, 1M14F, 16M7F, 5M
NiagaraCherry3M, 3F33F, 1MRETIRED
Wildn/a017F, 7M42F, 6M74F, 14M
Mulberryripe4F, 1M19F, 1M26F, 10M110F, 60M
Raspberryripe1F, 1M59F, 16M25F, 19M425F, 48M
Peachripe6F18F, 8M
NiagaraCurrantripe02F24F, 3M7F, 2M
Blackberrygreen fruit03F58F, 19M68F, 15M
Raspberryripe03F22F, 9M40F, 5M
Nectarineripe7F, 8M32F, 28M
NiagaraApricotripe01F11F, 14M2F
Plumturning colour1F 2F, 2M61F, 25M45F, 11M
Nectarineturning colour01F14F, 17M4F, 1M
Peachturning colour0020F, 18M12F, 2M
Cherry post harvest02F, 1M37F, 6M37F, 18M
NiagaraPeachturning colour002F2F
Peachturning colour03F2F, 1M1F, 2M
NiagaraRaspberryripenot reported3F15F, 12M18F, 6M
Cherryharvestnot reported9F91F, 28M29F, 7M
Cherrynot reported3F45F, 18Mnot reported
Raspberryripenot reported0not reported53F, 63M
Durhamwild00not reportednot reported
Blueberry01Fnot reportednot reported
Blueberry01Fnot reportednot reported
Blueberry00not reportednot reported
NorthumberlandWild08F, M1not reportednot reported
Raspberry1F8F not reportednot reported
Raspberry01Fnot reportednot reported
Strawberry03F, 1Mnot reportednot reported
OttawaStrawberrynot reported1Mnot reportednot reported
Strawberrynot reported0not reportednot reported
Strawberrynot reported1Fnot reportednot reported
Wildnot reported0not reportednot reported
OttawaStrawberryharvest001F,5M1F, 1M
Strawberryharvest0015F, 13M11F, 32M
Strawberryharvest01F10F, 15M5F, 10M
Wildn/a01M22F, 56M12F, 69M

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.

SWD has been identified in all monitored areas and counts have continued to increase A similar monitoring program in Michigan is also reporting increasing SWD pressure:

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.

According to David Jones, MSU extension, “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.  We are currently testing susceptibility of apricots and plums 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 with different plums and apricots as they ripen and into peaches and grapes.

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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