Asian Fruit Fly

Asked June 26, 2013, 4:08 PM EDT

Good afternoon ~ My husband and I have a few rows of raspberries and boysenberries. We are very concerned with the Asian Fruit Fly. Our boysenberries were affected last year, but believe that our raspberries were saved (due to being a tad earlier). I am concerned, however, on how to protect our small crop. I would prefer not to use pesticides, but wonder if there are any options available. We both come from farming backgrounds and have several friends who grow blueberries, raspberries, etc. in mass production. The article that I just read mentioned publications on how to tell if our crop has been invaded, ways to protect the crop, etc. Can you please advise me on where I can find these publications and how I can keep up-to-date online as the article also suggests? Thank you!! :)

Washington County Oregon

1 Response

I believe you are referring to the vinegar fly called spotted wing drosophila (SWD). The female fly lays eggs in ripening fruit and you may see the larvae in the ripe berries. We have a large team of entomologists researching the biology, impact, and management of this insect pest on fruit crops in the Pacific Northwest. We have learned a lot in the 3 years this pest has been found in Oregon. You can find a great summary of knowledge on SWD at the OSU website (
You will notice that this pest is very difficult to control in the home garden and, unfortunately, the SWD really like raspberries. Here's a good publication on your options: