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Strawberries and Caneberries
University of California Agriculture and Natural Resources Agriculture and Natural Resources Blogs
SUN, OCT 25 2020
by Sage Finch
on June 21, 2009 at 9:03 PM
This pest can be found throughout Oxnard on raspberries and blackberries. I found it last week at low levels in Santa Maria in raspberries.
by Mark Shimozaki
on June 28, 2009 at 10:09 PM
Has anyone had a problem with this pest in grapes ? Either table or wine.
by Mark Bolda
on June 29, 2009 at 7:45 AM
As far as I know, Mark, no.
by Win Rogers
on June 30, 2009 at 1:55 PM
UC Cooperative Extension of San Joaquin County is hosting an informational meeting CVF.  
Wednesday, July 8, 2009  
1:30 - 3:30 p.m.  
at the:  
Robert J. Cabral Agricultural Center  
2101 E. Earhart Avenue, Stockton CA  
(use Google maps)  
(209) 953-6100
by Mark Shimozaki
on July 9, 2009 at 7:01 AM
As my understanding from yesterdays meeting, the SWD likes moist humid conditions. In the cherry orchards with mini sprinklers you may have that enviroment slightly. In the vineyard we definately do not have that condition. Do you think possibly this enviroment would not be conducive ? Placement of traps in a vineyard, any comments ?  
Thanks for your help !
by Mark Bolda
on July 9, 2009 at 7:52 AM
Hi Mark,  
Yes SWD (Spotted Wing Drosophila for new readers, the name has changed, I will try and post an update today), likes moist humid conditions. In the caneberry traps, anything that is exposed and in the sun traps very few flies, while dark moist areas tend to have a lot more. According to Arturo, the Drosophila expert from Davis, moisture is really key for Drosophila, so it you don't have it, you won't have a whole lot of vinegar flies.  
So you know, we don't pick up a lot, if any, SWD in strawberries that are away from infested caneberry fields, and the infestation seems to be more incidental from flies blowing in from next door. I think it must be because there is not a lot of shade nor available moisture (moist soil is under a tarp) for the flies to thrive. With this in mind, perhaps they would not be a problem in the drier environment of grapes, but we really don't know everything at this point.  
By the way, that was a good meeting yesterday and kudos to the CE staff that pulled everybody in that had any information at all on SWD.
by Brian Schmaedick
on July 15, 2009 at 5:13 PM
We have a little "urban orchard" In the east San Jose foothills and have been disheartened this year by an invasion of the swd. We have discovered it in our Ollalie berries, cherries (Bing, Ranier, and Black Tartarian), and most recently in our Santa Rosa plums. We are afraid to check our other plum varieties that are ready for harvest soon. We have been tempted to do a 'revenge' spraying, but have held off so far. We picked all the cherries and discarded them appropriately and will be doing the same with all the SR plums left on the tree this evening. Ugh!
by Connie
on April 5, 2010 at 7:30 PM
Decimated my Bing cherry crop this past summer in Willow Glen. Am waiting with bated breath -
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