No way to prevent it.

To possibly minimize, if you haven't already done so, pickup & discard all windfalls. (Probably more than a tad late to do that because the critters also overwinter in leaf litter and surface layers of soil.

Come the growing season, remain alert!

jean001,

While I am sure you mean well, it might be good to hold your "opinion" until more knowledge is known about this pest. Some of the best entomologists in the PNW are working on this pest, even they dont have a good idea on what you should and should not do.....yet!!

Schmoo

Prevention practices that include common sense housekeeping tasks will certainly be a part of the control measures.

It was said "While I am sure you mean well, it might be good to hold your "opinion" ..."

As it turns out, that is the most recent word from the experts, including the researchers from the involved agencies. Research is ongoing and not yet finalized... and won't be for quite some time.

Current estimates suggest the fly may have as many as 12 generations per year in OR. That's a change from the estimate of 3 or 4 generations/year the experts offered in Oct 2009.

Bottom line: Multiple agencies are working their buns off trying to determine final answers as to life cycle, baits that will be useful aids to monitor populations, successful management, and much much more.

When it comes to managing home garden fruits, the most recent word from the experts is to collect all infested fruits (from the plant and/or ground), package securely in heavy plastic, then place in the trash.

A footnote: The experts suggest everyone consider "fruit" in the broadest sense of the word. In other words, consider all fruits -- be that edible, ornamental, or other -- to be potential targets of these flies.

Oh yes, here's something that may help your hair turn gray: feral blackberries.

"Oh yes, here's something that may help your hair turn gray: feral blackberries."

Ouch...that is scary for people around the PNW.

Schmoo

Yep, i read last fall: collect, destroy and so on. I had SWD on my raspberries last fall. I tried to collect and destroy everything, but I am afraid that still some SWD's are sleeping in my soil.
Now i am thinking what will be good to do to kill them in soil. I got a lot of coffee grounds from coffee shop and covered soil around raspberries hoping that leftover cofein will help.
Any other ideas?