What product to use on spotted wing drosophila found on boysenberries and strawberries

Asked April 12, 2017, 7:26 PM EDT

As a home gardener what product(s) can I obtain to combat spotted wing drosophila that attack our boysenberries and strawberries? I understand thoricide (bacillus thorengiensis) is effective but that there are different formulations?? Your advice will be greatly appreciated. Thank you, Mary Hall

Coos County Oregon

1 Response

Spotted Wing Drosophila (SWD for short) management is going to be a little tricky, but here are some tips: Please note that Bacillus thuringiensis (Bt) based products are not recommended for management of SWD. This active ingredient is typical effective against caterpillars of moths not fly larva.

The chemical products labeled for home garden use include:

  • acetamiprid-In field tests, this product has provided inconsistent control of SWD.
  • azadirachtin (neem oil)-This product has been shown to provide about 25% control of SWD.
  • pyrethrins-These products provide about 80% control of SWD but have no residual activity.
  • spinosad-This product generally provides 100% control and 5-7 days residual activity.
  • zeta-cypermethrin (**do not use on the strawberries)
Keep in mind that chemical pesticide use is most effective when coupled with good cultural control and sanitation. There is a list of suggested management techniques if you scroll down about midway through the OSU Extension webpage on SWD.
Look for the section titled: 'Management—cultural and physical methods'

If you have additional questions please don't hesitate to contact us again or call your local OSU Extension office.

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