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Strawberries and Caneberries
University of California Agriculture and Natural Resources Agriculture and Natural Resources Blogs
FRI, JAN 15 2021
by Melita Israel
on June 22, 2009 at 4:06 PM
I grow starwberries and raspberriea and blackberries. See on sign of these flies here in Apots Hills.  
Noticed many flies on my car today. they seems to be drinking sap that was on the car. (?))
on August 20, 2009 at 2:34 PM
Excellent information , thank you
by Michelle Fountain
on January 4, 2011 at 3:55 AM
Please could I have permission to use the picture of the larvae inside the raspberry for a factsheet I am preparing, free of charge, for UK fruit growers to help them identifiy the pest once it enters the UK?  
Michelle Fountain  
East Malling Research  
ME19 6BJ  
by Mark Bolda
on January 4, 2011 at 7:17 AM
by Lucy Heyming
on April 24, 2012 at 8:31 PM
I may have these on my strawberries. Just noticed them today after a spell of very warm weather. My boysenberries had them last year. I have removed all the old debris from under my berries, but these flies have come back. Is there anything I can do without using a pesticide?  
Lucy Heyming
by Mark Bolda
on April 25, 2012 at 5:10 PM
Hi Lucy,  
You could try intensive trapping around the area with apple cider vinegar or the yeast sugar water concotion mentioned elsewhere in this blog. We have never been able to gain satisfactory levels of control with trapping. I think sanitation as you describe will help somewhat, but will not completely eliminate these flies.  
by Barbara B
on July 28, 2013 at 7:07 PM
what if you ingest the larvae while eating fresh raspberrys? Is it harmful? Will they stay alive in humans?
by Mark Bolda
on July 29, 2013 at 7:42 AM
Hi Barbara,  
Thanks you for your question, and the answer is quite simply no. These are vinegar flies, meaning the larvae can't survive outside of fruit, much less in the caustic, harsh environment of the human digestive system.  
by Steve Robbins
on September 5, 2013 at 10:51 AM
I live in Weld County, Colorado (North Central Colorado). I recently observed the white biarmipes larvae in my raspberries. The average count was about 10 per berry. I will try to control with malathion. Has there been any reports from Colorado?
by Mark Bolda
on September 9, 2013 at 3:49 PM
You should check with your extension service for information on your particular area.  
by Marion Behrman
on April 3, 2014 at 7:36 AM
I bought home with 100 ORGANIC blueberry bushes on it November 2013 & I live in S.W. Michigan. I've been told they get the larvae in them produced by fruit flies. To keep them "organic", I need to know what I might do, instructions on what to do & when to do it to protect from the pest. We had a harsh winter, so everything late this year, but the bushes are just starting to bud. Someone said to sprinkle cornmeal around base of bushes, that it would help keep weeds down & maybe help with the fruit flies. Will the "worm" affect your health, if ingested? Can you see the larvae in the fruit with the human eye? Thank you for any suggestions for raising and harvesting my blueberry patch. It is an older patch, but prior owners said the production last season was exceptional. Me & my family love blueberries & hope to have a good crop. THANK YOU.
by Mark Bolda
on April 3, 2014 at 11:36 AM
Hi Marion,  
No, the larvae of the fly will not cause harm if consumed. Yes, at an advanced stage they are visible, but normally they are not.  
Cornmeal I doubt will do anything at all. What you should consider is perhaps putting fine mesh nets over the blueberry plants so the flies can't get in a week or so before maturity. Sanitation, in other words removing over-rip fruit, from on and around the plant can help.  
If you are looking for organically registered sprays, there are references to how well they work on this blog.
by Mick. Gallace
on May 10, 2014 at 1:48 PM
Hi. Mark , can raspberry plants be affected by macrophormina or is it only confined to strawberry plants ?
by Mark Bolda
on July 1, 2014 at 8:36 AM
Hi Mick,  
This is I learned from our plant pathologist Steven Koike, but it is doubtful that the Macrophomina infecting strawberries goes to raspberries. Not 100% sure though.
on January 24, 2015 at 6:48 AM
m'autorisez-vous à utiliser votre photo "Drosophila biarmipes on raspberry fruit", pour illustrer un article à paraître sur le site de la Société Nantaise d'Horticulture.  
merci de votre réponse.  
Mary Fruneau
by Mark Bolda
on January 24, 2015 at 7:33 AM
Bonjour Marie! Bien sûr, vous pouvez utilisez l'image - Je suis heureux que vous le trouvez utile.  
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