2012 Ontario Trap Catches: Spotted Wing Drosophila

Table of Contents

  1. Weekly updates for Ontario
  2. Map of trap locations
  3. Funding
  4. SWD historical data
  5. Links to weekly updates in other regions

Weekly updates for Ontario

This map shows the results of the weekly trap catches and indicates where SWD has been found in Ontario.

How to use this map: Select a date from the drop down menu to display the results from that week. Click on each county to display more detail. How to interpret the colours:

  • Orange - county/region where SWD has been found
  • Green - county/region where no SWD were found
  • Grey - county/region monitored in 2012, but no samples collected for current week

Total SWD finds per week

Week ending # positive sites this week # positive sites to date # flies total this week
June 29
5
5
12
July 6
7
9
11
July 13
11
15
29
July 20
36
39
100
July 27
34
56
105
Aug 3
41
65
338
Aug 10
64
82
3,067
Aug 17
59
88
1,322
Aug 24
57
91
6,455
Aug 31
70
92
11,444
Sept 7
61
96
9,152
Sept 1
65
99
5,369
Sept 21
61
100
8,150
Sept 28
54
100
10,935
Oct 5
44
100
11,539
Oct 12*
44
101
14,794

*samples still being processed for this week.

Summary of counties where SWD has been found 2012

County/region # sites monitored # sites positive in 2012
519 Southwestern Ontario
Essex 15 9
Kent 10 10
Lambton 2 2
Elgin 3 3
Middlesex 3 3
Perth 1 1
Oxford 4 4
Norfolk 10 10
Brant 3 3
Waterloo 4 2
Grey 2 2
Huron 1 1
705: Northern and central Ontario
Bruce 1 1
Simcoe 4 3
Temiskaming 1 1
905: South central Ontario
Haldimand 2 2
Niagara 27 26
Hamilton-Wentworth 2 2
York 3 3
Halton 1 1
Durham 3 3
613: Eastern Ontario
Prince Edward 3 2
Northumberland 2 1
Frontenac 1 1
Lennox and Addington 1 1
Ottawa-Carleton 4 4
Total
101 sites in 26 counties

October 26, 2012:

This week SWD was found at one new location in Essex County.

We are currently still monitoring at 57 sites across Ontario. Although the number of traps in the field has been reduced, the total number of SWD caught has continued to increase, indicating the populations are still building.

Growers with ripe fruit should still be watching for damage and picking cleanly and often.

October 19, 2012:

We have started removing traps at some locations in Ontario. Trap catch numbers are still very high, but we expect that they will be dropping as we move into colder weather. We will be monitoring a few sites into the winter to determine when SWD activity slows down.

Growers should continue to watch for damage in fall bearing raspberries and day neutral strawberries. The most important practice at this point is picking thoroughly and often. Post harvest sprays are not recommended.

October 12, 2012:

We continue to monitor at 73 sites to see what happens to spotted wing trap catches post harvest and as temperatures start to cool down.

Numbers in our traps are still very high and seem to be increasing. Similar trap catch patterns have been observed by our colleagues in the Maritimes.

There have been reports from other provinces of SWD damage to specific varieties of dark-skinned grapes, but there have been no reports of damage in Ontario.

There is still a risk of damage to fall bearing raspberries and day neutral strawberries. Except for crops in tunnels and greenhouses, we don't think insecticide applications at this point will be cost-effective. Picking thoroughly every few days is the most important management method. Post harvest insecticides are not recommended.

October 5, 2012:

SWD has been found at two new locations this week:

  • Niagara (1 site)
  • Kent (1 site)

The number of SWD in trap captures has increased from last week. The mild, damp weather provides good conditions for SWD to build populations.

This pest is still being found in all regions, and growers should be on the lookout for damage in any crop that has ripe and ripening fruit.

Spotted-wing drosophila in tomatoes

Spotted-wing drosophila (SWD) has become a widespread pest of soft-skinned fruits in Ontario. Although there are indications from other parts of North America that it may attack tomatoes, little is actually known about its potential impact in the crop. Cracked tomatoes may be at highest risk, and damage to intact tomatoes may depend on the thickness of the skin.

OMAFRA has been monitoring for SWD at tomato sites in 2011 and 2012. The pest has been found in traps in tomato fields, but it has not yet been found infesting tomato fruit. In both 2011 and 2012, the number of SWD caught in traps increased dramatically after tomato harvest (in some cases, none were trapped at tomato sites until after the crop residue had been plowed under in late fall).

OMAFRA and the research team are trying to determine if the pest is surviving on tomatoes or using nearby wild plants (eg. wild berries, pokeweed) and other crops as hosts. Growers are encouraged to contact OMAFRA with any observations of possible SWD in tomato crops.

Contact Janice LeBoeuf for more information

Photos and information on identifying the pest.

September 28, 2012:

SWD is still being trapped at most locations in Ontario and numbers remain high. In some locations, the number of spotted wing drosophila is continuing to increase as crops are finishing harvest. This is the same pattern that we saw last year in Ontario.

However, we are not recommending post harvest sprays to growers unless they have an adjacent susceptible crop that is still being harvested.

SWD counts are also increasing in wild hosts along the edges of fields. These could provide a place for SWD to overwinter. Growers should not spray border vegetation with insecticides, but should be monitoring them first thing next spring.

We are continuing to catch low numbers of SWD in grapes at several locations across Ontario.

At this point, we don't know the full impact of SWD on grapes, as there appears to be conflicting information. In some cases, spotted wing seems to only infest damaged grapes. However, some US researchers have found that it may attack sound fruit of certain wine grape varieties. Grape growers should be on the lookout for unusual patterns of damage, such as premature breakdown of fruit.

If you suspect you have SWD damage in grapes, contact Wendy McFadden-Smith for more information.

September 24, 2012: Last week, there were new SWD finds in the following counties:

  • Kent (3 sites)
  • Essex (2 sites)

SWD is widespread across Ontario and numbers in traps are still very high. Growers should be on the lookout for damage in ripe and ripening fruit, especially in fall raspberries, blackberries and day neutral strawberries. Growers should also look around the edges of the field to see how many wild hosts there are for SWD. We have reared SWD from pokeweed, dogwood, wild elderberry and wild brambles. Do not spray hedgerows and border vegetation with insecticides. However, do look around fields to identify places where SWD could overwinter and where you should be monitoring first thing next spring.

September 14, 2012: We are continuing to monitor for SWD at more than 70 sites in 24 counties.

Samples are currently being processed and new results will be posted as soon as they are available.

This pest has been found in all monitored regions in Ontario and we are still finding many SWD in trap collections. Growers should be on the look out for damage in fruit crops. Fall raspberries and day neutral strawberries are at high risk right now.

There has also been an increase in reported problems with this pest, especially where fruit has not been sprayed.

Information on how to identify SWD fruit damage.

Have a look at some frequently asked questions about spotted wing drosophila.

September 7, 2012:

This week, we are transitioning into the fall season, as our summer students have finished and traps are coming down at several locations. More data will be posted next week.

SWD is widespread across Ontario, as well as many other provinces and states across North America. Berry crops that are ripening are at risk for this pest. This pest is manageable, although it requires a lot of effort and changes to your normal management practices.

It is important to harvest early, clean and often. Instruct workers to discard unmarketable fruit and remove it from the field, because SWD adults will emerge from dropped fruit and multiply in the crop. Insecticides are also necessary to protect fruit from small adult SWD flies.

Traps have recently gone up at grape and tomato sites and low numbers of SWD have been captured in some locations. However, at this point we are unsure of the impact that spotted wing will have on these crops.

Given that this insect can cause injuries to fruit when it lays eggs, which may in turn provide entry points for other organisms, it is wise to do as much as possible to minimize the impact of this pest with good sanitation and use of a product that has some activity against SWD in routine sprays for other insect pests.

Information on emergency use registrations.

August 31, 2012:

This week, SWD has been detected at new sites in the following regions:

  • Timiskaming (1 site)
  • Prince Edward (1 site)

SWD has now been detected at all monitoring locations in Ontario. All growers should consider this pest present at their location, be able to identify its damage, and take precautionary steps.

Emergency use registrations.

Information on identifying and sampling fruit.

August 24, 2012:

This week, there have been new SWD finds in the following regions:

  • Essex County (1 site)
  • Niagara Region (1 site)

Last week, new sites in Brant, Durham, Elgin, Grey, Northumberland and Ottawa/Carleton counties also reported new SWD finds.

Spotted wing drosophila (SWD) has now been trapped at most locations in Ontario. All growers in Ontario should consider this pest present at their location, be able to identify the pest and its damage, and take precautions.

The number of flies caught continues to increase. This means that SWD is multiplying in susceptible fruit crops and in wild hosts, and that populations are increasing on farms and in the landscape. Recent rains have created humid conditions in the plant canopy that favour SWD activity.

August 22, 2012:

Spotted wing drosophila (SWD) has now been trapped at most locations in Ontario. All growers in Ontario should consider this pest present at their location, be able to identify the pest and its damage, and take precautions.

The number of flies caught continues to increase. This means that SWD is multiplying in susceptible fruit crops and in wild hosts, and that populations are increasing on farms and in the landscape. Recent rains have created humid conditions in the plant canopy that favour SWD activity.

Berry crops are susceptible as the fruit is ripening, through to the end of harvest. Blueberries, fall bearing raspberries and day neutral strawberries, and any other berry crop that is ripe or nearly ripe are at risk.

August 17, 2012:

Spotted wing drosophila has now been trapped at most locations in Ontario. At a few sites, adult flies have not been trapped but damage has been reported. All growers in Ontario, should consider this pest present at their location, be able to identify the pest and its damage, and take precautions. Berry crops are susceptible as the fruit is ripening, through to the end of harvest.

This week, Northumberland and Bruce County have had their first reported catches of SWD adults. This pest is now present in 25 of the 26 counties being monitored.

The number of flies caught in traps is also increasing, this means that SWD is multiplying in susceptible fruit crops and populations are increasing on farms. There have been over 100 flies captured at several sites, with counts over 1000 in some cases. Recent rains have created humid conditions in the plant canopy that favour SWD activity.

August 10, 2012:

We continue to find SWD at more sites across Ontario and numbers are starting to increase significantly at many sites.

We have had our first spotted wing find in Halton county this week.

August 3, 2012:

This week, we have had our first SWD finds in the following Counties:

Durham Region

York County

We have found spotted wing at 65 different sites in 23 counties.

SWD has now been detected in all counties of Southwestern Ontario. Growers in most of Ontario should consider this pest to be present and take steps to prevent outbreaks in susceptible crops such as blackberries, blueberries and fall bearing raspberries.

We have been trapping most flies from wild hosts at the edges of fields and from raspberries where harvest is nearly complete. No commercial damage has been reported, however we have found larvae in a few blueberry and raspberry fruit. SWD populations are increasing now.

July 27, 2012:

Counts have increased noticeably in the past week. We have been trapping most flies from wild hosts at the edges of fields and from raspberries where harvest is nearly complete. No commercial damage has been reported, however we have found larvae in a few blueberry and raspberry fruit.

Blueberries, blackberries and fall-fruiting raspberries, peaches and other stone fruit are at risk now. Although not the preferred host, day-neutral strawberries are also susceptible.

New Finds this Week:

Waterloo region (1 site), Brant County (1 site), Oxford county (1 site), Simcoe county (1 site), Niagara region (3 sites), Norfolk county (4 sites), Haldimand county (1 site), Essex county (1 site), Ottawa/Carleton (1 site) and Lennox & Addington (1 site)

July 20, 2012:

**Update: There have been new reports of SWD in the following region this week:

  • Brant County (1 site)
  • Kent County (3 sites)
  • Norfolk County (2 sites)
  • Lambton County (1 site)
  • Niagara Region (1 site)

We are catching more spotted wing drosophila in our traps, with new sites showing positive again this week. All growers in southern Ontario should assume this pest is present in their area.

The number of SWD trapped is also increasing. Many of our trap catches have been from wild hosts and hedgerows. As numbers start to climb, we think berry crops will be at a greater risk, compared to the past few weeks. Raspberries, blackberries and blueberries are very susceptible at this time.

SWD counts to July 20:

Southwestern Ontario:

  • Essex County - 3 sites *1 new
  • Kent County - 2 sites *1 new
  • Middlesex County - 1 site
  • Elgin County - 1 site
  • Oxford County - 2 sites *1 new
  • Norfolk County - 3 sites *1 new
  • Haldimand County - 1 site *new
  • Perth - 1 site
  • Grey County - 1 site
  • Huron County - 1 site
  • Waterloo region - 1 site *new

Central Ontario:

  • Niagara Region - 8 sites *6 new
  • Hamilton-Wentworth - 2 sites * new

Eastern Ontario:

  • Prince Edward County - 1 site new this week
  • Frontenac County - 1 site

July 13, 2012:

We continue to find SWD at new locations across Ontario. This pest has been detected at 12 sites in 11 counties so far. Growers in southern Ontario should assume this pest is present and take precautions to prevent this pest in your berry crops. Growers in all areas should be aware of the potential for this pest.

This week, there have been new reports of SWD in the following counties:

  • Perth County (1 site, 1 male)
  • Middlesex County (1 site; 4 flies)
  • Frontenac County (1 site; 2 flies)

Growers should take note that this is the first catch for eastern Ontario.

July 6, 2012:

**Update: SWD has been detected at a commercial farm in Norfolk county.

We are currently monitoring for SWD with 300 traps in 26 counties.

So far, for the week of June 29 - July 6 there has been a new report in Niagara region (1 site, 2 females) and in Huron County (1 site, 1 female). No infested fruit have been reported. However, it is important to control SWD if there have been captures in your area and fruit is turning colour.

June 28, 2012: First spotted wing drosophila (SWD) capture for 2012.

**Update: SWD has also been detected in the following regions during the period of June 22-29: Oxford County (1 site; 2 males)

  • Kent County (1 site; 1 male, 1 female)
  • Elgin County (1 site; 1 female, 2 males)
  • Grey County (1 site; 4 females)

SWD has been detected in Essex County. A single female was collected during the week of June 18-25 in an apple cider vinegar trap placed on a commercial farm. Last year, we did not detect SWD in the field until the middle of August, and numbers did not increase until late September. We expect that SWD populations will build up earlier than last year, potentially placing summer crops at risk. No infested fruit have been reported. However, it is important to control SWD if there have been captures in your area and fruit is turning colour.

June 22, 2012: We are working with a network of scouts, consultants and researchers to monitor for SWD at over 100 sites in fruit and tomato crops across Ontario. So far, SWD has not been detected in Ontario in 2012. However, new reports of activity are coming from the south-eastern states, Michigan and British Columbia. Although SWD showed up too late in Ontario to cause damage in 2011, it will probably be earlier in 2012. At present, strawberries, raspberries, cherries, and early blueberries are susceptible to attack. If SWD is detected in your area, be ready to apply controls. Watch for soft or "leaky" fruit that breaks down prematurely. Fortunately, emergency use registrations for Malathion, Ripcord, Delegate and Entrust have been approved for 2012.

June 1, 2012: Traps for SWD are going up at many locations across Ontario. We have been trapping since mid-May in some of last year's hot spots and have not detected spotted wing drosophila so far. We know that wild raspberries and other wild brambles can be a host for this invasive pest. Have a look around the edges of your field and try to mow or chop down these wild raspberries to reduce fruit development. When should you spray for SWD? Crops are not at risk until fruit starts to ripen, and flies are present. Green is still too hard for egg-laying. Stay tuned to the berry bulletin and our website, www.ontario.ca/spottedwing for updates, information on trapping, and SWD management.

Emergency use requests for the following products have been approved for SWD control on most berry crops in Ontario:

  • Ripcord
  • Entrust
  • Delegate
  • Pyganic (registered on raspberries, and blueberries but may not be available)

We have also applied for malathion, but this registration is not yet in place.

May 26, 2012: With assistance from the OBGA and OFVGA we have hired a coordinator, Anne McDonald, for our Spotted Wing Drosophila monitoring program. We will be monitoring at more sites and more counties this year. Reports from southern and western USA suggest SWD could be active earlier than in past years. In Ontario, we have not identified SWD this spring. Stay tuned to the berry bulletin and www.ontario.ca/spottedwing for updates. We expect to have emergency use registrations in place for fruit crops by early June.

Trap Locations in Ontario 2012

Map of Ontario showing trap sites for Spotted Wing Drosophila

Figure 1. Trap locations for Spotted Wing Drosophila in Ontario, 2012

Trapping sites are in these counties/regions: Brant, Chatham-Kent, Durham, Elgin, Essex, Frontenac, Grey, Haldimand, Halton, Hamilton-Wentworth, Huron, Lambton, Lennox and Addington, Middlesex, Niagara, Norfolk, Northumberland, Ottawa-Carleton, Oxford, Prince Edward, Simcoe, Temiskaming, Waterloo, Wellington, and York.

OMAFRA specialists are monitoring the development of the new pest, spotted wing drosophila (SWD) in Ontario. With the help of consultants and agribusiness scouts, a network of more than 106 sites in 25 counties across Ontario has been established.

Funding: This project was funded in part through Growing Forward, a federal-provincial-territorial initiative. The Agricultural Adaptation Council assists in the delivery of several Growing Forward programs in Ontario.

Links to Weekly Updates from Other Regions


For more information:
Toll Free: 1-877-424-1300
E-mail: ag.info.omafra@ontario.ca