SWD Update 6 June 2012

Publication Date: 
SWD 06-06-12.pdf22.49 KB

Spotted Wing Drosophila Update for 6-6-12

This Update is a collective effort. It is composed by Peerbolt Crop Management with contributions from OSU, USDA-ARS, WSU, B.C. Ministry of Agriculture and various Northwest berry industry people.


SWD Information Websites

Peerbolt Crop Management
Oregon State Univ.
B.C. Ministry of Ag.
WSU Westside
WSU Eastside

SWD alert for Oregon and SW Washington strawberries

• Survey trap numbers continue to indicate higher populations of Spotted Wing Drosophila than in the previous two seasons.
• Given the amount of ripe and ripening fruit now in the fields that will attract SWD, the apple cider vinegar attractant used in the monitoring traps can no longer be depended upon as a reliable indicator of the presence or absence of this vinegar fly.
• All growers are encouraged to be proactive:
   o Consider applications of insecticides to prevent potential fruit infestation.
   o Monitor fruit closely both before and during harvest for SWD larvae.
   o Be knowledgeable regarding control measure options and be able to react quickly if any infestation is detected.


Additional Comments

• This week processed strawberry harvest will begin in Western Oregon and SW Washington. There’s a lot of ripe and ripening fruit now susceptible to SWD damage.
• Many commercial strawberry growers go on with a pre harvest broad spectrum insecticide (usually bifenthrin) for weevil and strawberry crown moth management. This application will also be effective for SWD control.
• Some cherry sites as well as some wild habitat sites continue to record very high numbers of SWD adults.
• Some of the adult flies now being caught are of the newly hatched first seasonal generation and not overwintering adults.
• Duke blueberries in the same region are just beginning to color. At this point there are no recommendations for treating them this early.


Pictorial chart of other vinegar fly species that could be mistaken for SWD

This is from Penn State. I’d need some input from our regional entomologists to say how well this applies to the northwest but it’s something we need—a way for everyone to be able to distinguish SWD from look-a-likes.
Click here for the fact sheet with photos.


SWD in the news

Spotted wing drosophila makes early appearance (5/31, Capital Press)
SWD risk to Oregon early fruit heightened (5/18, Capital Press)


Regional Monitoring (South to North)

Oregon Public Scouting Program count for the week ending on 6/1
(Number of traps checked this period in the crop in parentheses).
This scouting program and reporting system are being funded by a USDA SCRI grant, and a Northwest Center for Small Fruits Research grant
Linn County: Apples(1): none. Blackberries (7): 1 male/5 females. Black Raspberries (2): none. Blueberries (3): none. Other caneberries (4): none. Cherries (2): 6 males/18 females. Grapes (2): no males/2 females. Peaches (2): 3 males/43 females. Pears (1): 2 males/5 females. Plum(2) no males/1 female. Raspberries (3): 2 males/5 females. Strawberries (8): no males/ 2 females. Tayberries (1): none Wild Habitat (19) 42 males/198 females.
Polk County: Cherries (2): no males/1 female.
Benton County: Cherries (2): 2 male/9 females. Nectarine (1): 1 male/no females. Peach (2): 3 males/2 females. Raspberry (1):none. Wild Habitat (4): 2 males/6 females.
Marion County: Strawberries (16): 1 male/2 females. Cherries (2): 510 males/200 females
Clackamas County: Strawberries (2): none. Honeysuckle (1): none.
Yamhill County: Cherries (6): none. Strawberries (7): none.
Multnomah County: Strawberries (5): no males/ 2 females. Cherries (1): no males/ 2 females. Blackberries (1): no males/1 female. Salmonberry (3): no males/ 3 females.

Southwest Washington Public Scouting Program for the two weeks ending on 5/4
Clark/Cowlitz/Lewis Counties: Strawberries (8): 11 males/ 18 females. Cherries (2): 25 males/20 females.

Eastern Washington
Click here for the WSU Eastern Washington SWD reporting site.
Latest report from the WSU site--Tuesday, June 5: “Positive find in Orondo this week. A single male was found in a trap in the Orondo region earlier this week. This brings the total to eight positive regions to date.”

Western Washington--WSU Extension Scouting Program
This scouting program and reporting system are being coordinated by Whatcom County Extension and funded in part by the Washington Red Raspberry Commission.
Click here for information on the program.
• In addition to fields being covered by the Raspberry Commission funding, scouting services will be available on a fee for service basis.
• If you are interested in services, contact Colleen Burrows at 360-676-6736 x 22 or cburrows@wsu.edu.

British Columbia
Click here for the SWD Ministry of Agriculture site.
Click here for the June 4th report for coastal B.C. Traps are just being set up this week.
Click here for the B.C. Southern Interior Valleys report. During this past week, with more than 180 traps set up, there have been six confirmed females trapped primarily in cherry orchards.


SWD Management Material Resources

Oregon and Washington
Blueberries: SWD pesticide options and information
Raspberries and blackberries: SWD pesticide options and information
Strawberries: SWD pesticide options and information
British Columbia (6/28/11): SWD Management in BC Berry Crops (with insecticide options listed)