Liz Montgomery and Abby Lois, present their independent research project results from this fall semester in the Guédot Lab. The Guédot lab has conducted experiments to assess the susceptibility of table grapes, aronia, and tart cherries to SWD. To test susceptibility, we introduced lab reared SWD on undamaged and damaged fruits.

Undergraduates presenting research at University of Wisconsin -Madison

Table grapes, aronia, and cherries were all assessed for eggs, larvae, pupae, and adults in each separate experiment. Abby Lois has completed the cherry no-choice experiment and Jennifer Kuckuk has completed the aronia no-choice experiment. Data is still being processed for both. Liz Montgomery completed the table grape no-choice experiment and preliminary results suggest varietal differences and differences between damaged and undamaged grapes. 

Preliminary results presented on the susceptibility of table grapes to SWD

Check out Christelle’s interview from August 25, 2015 with Wisconsin Public Radio: Invasive fruit fly poses problem for Wisconsin berry growers – Many producers driven to abandon harvest due to spotted wing drosophila 

Below is the updated 2015 map for confirmed (Blue) and suspected (Green) counties in Wisconsin. We are continuing SWD monitoring but do not expect new counties to be detected this late in the season. Thank you again to all the collaborators this summer, and we look forward to working with you all again! Please email swd@russell.wisc.edu if you have questions or you can visit the Guédot Lab Website for more information on other pests. 

SWD has been confirmed in 42 counties in Wisconsin and are listed below in the table. 

As of September 5, presence of SWD has been confirmed in 40 Wisconsin counties and is suspected in 9 counties.

We have confirmed SWD in Pepin, Dane, Rock, Iowa, Burnett, Waushara, Door, Tomah, Washburn, Portage, Barron, Pierce/St. Croix, Vernon, Jackson, Marinette, and Manitowoc Counties. It is suspected in Brown, Bayfield, Waukesha, Calumet, Fond du Lac, Kewaunee, and Sheboygan Counties.

SWD has been confirmed in Pepin, Dane, Iowa, Rock, Burnett, Waushara, Door, Tomah, Washburn, Portage, Barron, Pierce/St. Croix, and Vernon Counties. It is suspected in Bayfield, Brown, and Kewaunee Counties.

Thank you to all those who were able to come to the 2015 WBGA raspberry school in Shawano County, Wisconsin. We appreciate your interest, feedback, and continued help with the SWD Monitoring Project!

Many county representatives are reporting three consecutive weeks or more of SWD detection. So far, it is confirmed in Pepin, Dane, Iowa, Rock, Burnett, Waushara, Door, Tomah, Washburn, Portage, Barron, Pierce/St. Croix, and Vernon Counties. It is suspected in Brown County.

If you have any questions about SWD management, please contact Kathryn at swd@russell.wisc.edu

As of July 24th, SWD has been confirmed in Pepin, Dane, Iowa, Burnett, Door, Tomah, Washburn, Portage, and Barron Counties as well as Barron, Pierce/St. Croix, and Vernon Counties this week. It is also suspected in Waushara County.

Lots of news from Wisconsin counties this week!

As of July 17th, Spotted Wing Drosophila has been confirmed in Pepin, Dane, Iowa, Burnett, Door, Tomah, Washburn, Portage, and Barron Counties. It is also suspected in Waushara County.

If you are having problems with SWD, please see out Management page (https://swd.russell.wisc.edu/management-2/) for more information.

Summer-bearing raspberries are ripening, and we are receiving more reports of SWD in Wisconsin.

As of July 10th, SWD has been detected in Dane, Burnett, and Pepin Counties. We will receive trap specimens from several western and central Wisconsin counties in the next week and will update you with new developments. Thank you all for your continued participation and feel free to email Kathryn LeClaire with any questions at kleclaire@wisc.edu.

As of July 3rd we suspect the presence of SWD in Pierce county and will have confirmation on that location by next week. Raspberries seem to be ripening up so keep up the great work monitoring. 

Please send any trap catch information or questions to me, Katie Hietala-Henschell, at kghietal@mtu.edu or Jennifer Kuckuk at jlkuckuk@wisc.edu

Happy 4th of July! 

As of 6/22, SWD has been detected in Dane County. We will keep everyone updated as we hear from more growers across Wisconsin. 

Thanks again for everyone’s participation!

As of 6/12, no SWD has been detected in our traps.

Depending on your area and variety, you may already be seeing small unripe berries. SWD will oviposit in berries as soon as they begin to color, so be sure to remove ripe and damaged fruit as soon as possible to decrease the attractiveness of your field to SWD.

As of 6/5, no SWD have been found in our traps. Keep sending your results!

We now have a grower representing Pepin County, but we are still looking for growers in Vernon, Pierce, and Buffalo Counties. Please email Kathryn at kleclaire@wisc.edu if you are interested in collaborating.

We had a great time this week meeting growers in Pepin and Bayfield Counties through UW-Extension. Thank you for your interest in SWD!

The 2015 SWD Monitoring Project has begun. As of 5/29, no SWD has been detected in our yeast and sugar bait traps.

Keep informed with updates every Friday!

Please visit the Management Tab to see the updated SWD management recommendations. The management recommendation for Wisconsin fruit grower insecticide use was updated for blueberry, cherry, grape, raspberry, and strawberry.

As of 10/17/14, we have had no new confirmation of Spotted Wing within Wisconsin counties. This marks the end of our 2014 monitoring season. The Guedot lab would like to thank the continued participation and support of growers, extension agents, and other concerned Wisconsinites. We have included in this news update our confirmed and suspected Wisconsin counties for all the monitoring years, including 2014. 

As of 10/3/14, we’ve confirmed the presence of Spotted Wing in Shawano county. 

As of 9/26/14, we’ve confirmed the presence of Spotted Wing in Marienette and Racine counties. 

As of 9/19/14, we have confirmed the presence of Spotted Wing in Waukesha county. We also suspect the presence of Spotted wing in Marienette and Outgamie counties. 

As of 9/15/14, we’ve confirmed the presence of Spotted Wing in Marquette and Milwaukee counties. In addition, we have suspected presence in Portage and Marathon counties. 

SWD has been detected in Dunn and Bayfield counties. In addition, SWD is suspected in Milwaukee and Portage counties. 

SWD has been detected and confirmed in Dunn, Trempeleau and Bayfield counties.  

2014 SWD monitoring results as of 8/22/2014

We have recently detected and confirmed the presence of SWD in Washburn, Jackson and Monroe Counties.  Suspect larvae have been found in fruit in Trempealeau, Sheboygan and Washington counties but have yet to be confirmed as SWD. 

2014 SWD monitoring results as of August 7th, 2014

SWD has now been confirmed in St Croix and Crawford, and is suspected in Monroe, Washington and Sheboygan counties. Larvae have also been found in fruit at multiple locations. Active management programs, including cultural and chemical control methods, should be implemented if you have detected SWD and your fruit is at a susceptible stage. Continue monitoring to assess the effectiveness of your management program. 

SWD has been confirmed this week in Door, La Crosse, Rock, Dane, and Iowa counties. We also have reports from Washington and Monroe counties of larvae in the fruit (raspberry) that still need to be confirmed as SWD. Make sure to monitor for SWD.

Our first female was caught in a yeast and sugar trap in Vernon county. The traps were checked on 6/30 so the female was caught sometime in the preceding week. If you have not done so yet, make sure to place monitoring traps out and check susceptible fruit for signs of damage. Let the 2014 SWD season begin…

Still no confirmed SWD in Wisconsin as of Friday, June 20th.  Michigan reported their first SWD in traps on June 18th.  If you have not done so, deploy your monitoring traps as soon as possible.

As of June 13th no SWD have been detected in Wisconsin.  Some suspected flies are on the way to the lab to be identified and we will keep you posted as soon as we confirm whether or not they are SWD.

Minnesota reported the first sighting of SWD on June 6th.  If you haven’t done so yet, make sure to put your monitoring traps out (yeast and sugar bait recommended).  In 2013 our first trap catch was June 24th.

We have 17 collaborators throughout the state trapping in raspberry, blueberry, grape, and strawberry with the yeast and sugar bait. We hope to pinpoint the first occurrence of SWD this season throughout the state.  So far, no SWD have been confirmed in any of our participating counties.

We strongly suspect that SWD is overwintering in Wisconsin. The first detection in 2013 was on June 24^th and it is possible that SWD adults will show up earlier this season as they become established in the state. We also expect to get more reports of infestations and in more locations.

Commercial synthetic lures by Trécé, Inc. are now available for monitoring SWD from Great Lakes IPM (http://www.greatlakesipm.com/) for $3.45/lure and $29.50 for a pack of 10. Lures are good for 4 weeks.

• SWD was first detected in 2013 on June 24^th in Vernon County. The first detection in the 2013 monitoring project with an apple cider vinegar bait was on July 7^th in strawberry in Iowa County, towards the end of strawberry harvest.
• SWD larvae were found in fruit before adults were caught in traps, suggesting that apple cider vinegar is not a good bait for detecting first occurrence of SWD populations.
• SWD populations are not evenly distributed. Some traps caught no fly during the entire season while the maximum reached was 650 males and 500 females in a single trap in a single week!
• Crops vary in their susceptibility to SWD with caneberries likely being at the top of the list.
• Overall, we seemed to catch more females than males but this pattern might not hold true in every crop.
• Flies were still caught in late October (and even into November in another experiment)
• Take home message: for monitoring first occurrence, it is advised to use a yeast and sugar bait (1 tbsp. active dry yeast + 4 tbsp. sugar + 12 oz. water) instead of apple cider vinegar

2013 Wisconsin SWD Monitoring Data

Map of the occurrence of SWD per county. Updated September 3rd, 2013.

8/22/2013 SWD has been confirmed in Jackson and La Crosse Counties. 

Here is the map for SWD occurrence in Wisconsin.

8/9/2013 SWD has been confirmed in Jefferson, Monroe, Grant, Pierce, and Lafayette Counties.

7/31/2013 Spotted Wing Drosophila has now been confirmed in Racine and Rock Counties.

Spotted Wing Drosophila has now been confirmed in Crawford, Vernon, Iowa, Bayfield, Columbia, Dane, Sauk, Door and Trempealeau Counties. It is also suspected in Jefferson, Washburn, Kenosha, Wood, Pierce, Rock, Monroe, Buffalo, and Lacrosse Counties. Numbers of adults are still very low at each location, but larvae have been found in fruit at multiple locations. As you can see, SWD is rapidly appearing throughout the state at the same time suggesting that it is probably overwintering in Wisconsin.  

Spotted Wing Drosophila has now been confirmed in Bayfield, Columbia, Dane, Sauk, Door, and Trempealeau Counties. It is also suspected in Jefferson, Washburn, Kenosha, Wood, Pierce, and Rock Counties. Numbers of adults are still very low at each location, but some larvae (also in low numbers) have been found in fruit at multiple locations. SWD is rapidly appearing throughout the state at the same time suggesting that it is probably overwintering in Wisconsin.  

We are strongly recommending to monitor for SWD in your crop and take action if SWD is present and the fruit is at a susceptible stage.

Management recommendations for raspberry and soon to come for strawberry, blueberry, and cherry can be found on the Management page.

The Spotted Wing Drosophila was trapped in Iowa County. 

The Spotted Wing Drosophila was trapped in Crawford County.

The Spotted Wing Drosophila trapped in Vernon County.