This post contains a summary of trap counts for Aug 7-14, 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, 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.  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.

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.

CountyCropCrop stageNumber of SWD per trap
July 25- August 1Aug 1-7Aug 7-14
EssexField raspberry1st harvest14F,4M10F, 3M42F, 38M
Peachharvest020F, 13M89F, 21M
Wildn/a42F,10M165F, 113M547F, 265M
Plumgreen fruit2F, 1M48F, 27M43F, 18M
KentWild Hostn/a5F, 5Mnot reportednot reported
Raspberry8F, 2M16F, 10Mretired
Blueberry3rd harvest013F, 8M15F, 12M
Strawberry3F, 18M1Fretired
Strawberryripe4F, 16M
Raspberrypost 3rd harvest16F, 20M
NorfolkWild raspberryn/a18F, 23M26F, 46M15F, 17M
Blueberryharvest7F, 7M194F, 92M67F, 34M
Blueberryharvest62F, 4M142F, 42M36F, 10M
Blueberryharvest64F, 12M70F, 35M34F, 14M
NiagaraStrawberry11F, 14Mretired
Wild12F, 73Mretired
Strawberryripe2F, 1M21F, 15M12F, 5M
Wildn/a7F, 5M20F, 50M58F, 18M
NiagaraWildn/a74F, 14M42F, 44M40F, 23M
Mulberryharvest110F, 60M47F, 66M94F, 309M
Raspberryharvest425F, 48M169F, 59M63F, 62M
Peachharvest18F, 8M108F, 60Mretired
NiagaraCurrantharvest7F, 2M115F, 53M49F, 65M
Blackberryturning colour68F, 15M31F, 30M124F, 67M
Raspberryharvest40F, 5M60F, 26M46F, 83M
Nectarineharvest32F, 28Mreired
NiagaraApricotripe2F29F, 25M49F, 15M
Plumripe45F, 11M22F, 6M98F, 25M
Nectarineripe4F, 1M29F, 22M17F, 21M
Peachripe12F, 2M24F, 9M25F, 7M
Cherry 37F, 18Mretired
NiagaraPeachturning colour2F18F, 10M30F, 84M
Peachturning colour1F, 2M104F, 91M69F, 217M
NiagaraRaspberrypost harvest18F, 6M66F, 55M55F, 88M
Cherry29F, 7Mretired
Raspberrypost harvest53F, 63M29F, 29M18F, 20M
Niagaranectarineharvestnot reportednot reported71F, 49M
nectarineharvestnot reportednot reported16F, 14M
peachgreen fruitnot reportednot reported33F, 44M
peachgreen fruitnot reportednot reported53F, 32M
Niagaranectarineripenot reportednot reported5F, 4M
peachturning colournot reportednot reported2F, 2M
peachripenot reported7F, 7M18F, 18M
apricotpost harvestnot reported15F, 19M12F, 32M
Durhamwildn/anot reportednot reported7F, 26M
Blueberryharvestnot reportednot reported21F, 13M
Blueberryharvestnot reportednot reported8F, 3M
Blueberryharvestnot reportednot reported18F, 10M
OttawaStrawberry1F, 1Mretired
Strawberry11F, 32Mretired
Strawberry5F, 10Mretired
Wild12F, 69Mretired

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 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:  Our preliminary trial on apricot last year supported this observation.

Some research from Pennsylvania suggests that SWD may cause issues in grapes.  See this post from 2018 for more information.  We will be looking into this as grapes go into veraison and maturity in the next month or so.

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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