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Spotted Wing Drosophila Management

Management - Commercial Fruit Producers

(For Home Garden Recommendations scroll down this page)

The suppression of Spotted Wing Drosophila to levels low enough to protect a marketable crop required multiple tactics for success. First of all, it is important to use traps to determine when SWD begin to infest a field. Then, continuing to monitor susceptible crops with traps and fruit sampling to verify adequate control is recommended.

gathering cull strawberries from day neutral field (curtesy of Ontario Ministry of Agriculture, Food and Rural Affairs) There are 4 major types of tactics recommended:

  • Sanitation - keep area free of overripe fruit by harvesting frequently and thoroughly to reduce habitat for build up; collect cull fruit or fruit fallen to the ground; eliminate wild hosts as much as possible
  • Canopy Management - keep fruit planting well pruned and with open airy canopy as much as possible; this discourages the build-up of SWD which prefers cool, moist, shady locations.
  • Refrigeration of harvested fruit - move harvested fruit to refrigeration as soon as possible to reduce post harvest exposure to SWD and slow down any existing larval development
  • Chemical Control - use of short residual pesticides (organic and conventional) are likely the most effective short term solution for this pest.  The key principles are to make frequent thorough applications, use materials with short harvest intervals, rotate materials from among different mode-of-action groups (IRAC) to avoid the development of resistance in SWD populations to effective materials.  See chart below for recommended materials.

Additional tactics being tested:

  • Exclusion - small areas can be covered with fine netting or row covers prior to fruit ripening to keep SWD out or make treatment easier in confined space; this may be especially useful in high tunnels.  University of Vermont is recommending a product called Proteknet which is available from a Canadian Company, Duboisag.  See: http://www.duboisag.com/en/proteknet-exclusion-insect-netting.html or contact them at 800-463-9999.
  • Micro Sprinklers or Mistigation - research is being done in the application of different materials (control and repellent) using solid set micro sprinkler delivery; the advantage is ease of application (can treat whole area at one time) which makes frequent application more practical; disadvantage is that it works best in small blocks and requires up front investment for installing the system (see WSU Extension's Pest Management and Blueberry Mistigation For SWD Control for more information)
  • Biological Control - researchers are looking for suitable predators, parasitoids, pathogens and other beneficial organisms that might help suppress SWD populations.

Table 1. Insecticides for Blueberries, Strawberries, Brambles, and Grapes for Spotted Wing Drosophila

Active Ingredient

Trade name

IRAC code

Blueberry

PHI1  REI2

Brambles

PHI  REI

Strawberry

PHI  REI

Grapes

PHI  REI

Probable

Efficacy

Residual Activity

Organophosphates  
malathion

Malathion

1B

1

12 hrs

1

12 hrs

3

12 hrs

3

24-72 hrs

Good

5-7 days

methomyl

Lannate**

1A

3

24 hrs

--

--

--

--

--

--

Excellent

7 days

phosmet

Imidan

1B

3

24 hrs

--

--

--

--

7-14

14 days

Good/Excellent

 

Pyrethroids  
beta-cyfluthrin

Baythroid

3

--

--

--

--

--

--

3

12 hrs

Excellent

7 days

bifenthrin

Brigade**

3A

1

12 hrs

3

12 hrs

0

12 hrs

--

--

Excellent

7 days

bifenthrin

Bifenture**

3A

1

12 hrs

3

12 hrs

0

12 hrs

30

12 hrs

Excellent

7 days

esfenvalerate

Asana**

3A

14

12 hrs

7

12 hrs

--

--

--

--

Excellent

 

fenpropathrin

Danitol **

3A

3

24 hrs

3

24 hrs

2

24 hrs

21

24 hrs

Excellent

7 days

pyrethrin

Pyganic¤

3A

0

12 hrs

0

12 hrs

0

12 hrs

0

12 hrs

Fair

2-3 days

zeta-cypermethrin

Mustang Max

3A

1

12 hrs

1

12 hrs

--

--

1

12 hrs

Excellent

7 days

Neonicitinoids  
imidacloprid &cyfluthrin

Leverage 360 & 2.7

4A, 3

--

--

--

--

--

--

3

12 hrs

Excellent

 

actamiprid

Assail 30SG

4A

1

12 hrs

1

12 hrs

1

12 hrs

3

12 hrs

Good

 

clothianidin

Belay

4A

--

--

--

--

--

--

0

12 hrs

Good

 

dinotefuran

Venom

4A

--

--

--

--

--

--

1

12 hr

Good

 

imidacloprid Admire Pro 4A 3 12 hrs 3 12 hrs 7 12 hrs 0 12 hrs Good  
thiamethoxam Actara 4A 3 12 hrs 3 12 hrs 3 12 hrs 5 12 hrs Good  
Spinosyns  
spinetoram

Delegate

5

3

4 hrs

1

4 hrs

--

--

7

4 hrs

Excellent

5-7 days

spinetoram

Radiant

5

--

--

--

--

1

4 hrs

--

--

Excellent

5-7 days

spinosad

Entrust¤

5

3

4 hrs

1

4 hrs

1

4 hrs

7

4 hrs

Excellent

3-5 days

Growth Regulators  
pyriproxygen

Esteem

7

7

12 hrs

--

--

2

12 hrs

21

12 hrs

Fair/Good

 

Diamides
cyantraniprole Exirel 28 3 12 hrs -- -- -- -- -- -- Excellent 7 days

-- not labeled
¤OMRI listed for Certified Organic Production
** Restricted Use Material (requires Pesticide Applicator License)
1PHI= pre-harvest interval; time between last application and harvest
2REI= re-entry interval; time between application and when workers may re-enter the field
Probable ratings based on lab and field assays in western USA and Michigan

This is a guide. ALWAYS check the label!

Resources:

A complete discussion of SWD management practices can be found in the Penn State SWD Management Fact Sheet

Management - Home Garden Recommendations

coming soon