Score one for Pinterest: After an infestation of caffeine-junkie fruit flies this summer, I ran a search for organic solutions to the problem. This one, courtesy of Suburban Turmoil, kept coming up.
For any method to work on a long-term basis, you have to start by finding the source of your bugs. In our case, the flies came in with some dodgy bananas, invaded the compost bucket in search of coffee grounds (apparently a great favorite of fruit flies — not that I blame them) and decided the filter on the underside of the lid was an ideal place to raise kids.
To eradicate the larvae and eggs, we replaced the filter, and to kill the adults, I used Suburban Turmoil’s technique:
Get a Mason jar with a lid. Fill it about halfway with apple-cider vinegar. Add a couple of drops of dish soap, put the lid on the jar, and shake until it’s good and sudsy. Open the jar, add enough water to bring the bubbles up to the top, and leave it out overnight.
The bugs will smell the vinegar, think you’ve got rotten apples for them to snack on, and become trapped in the suds when they try to check it out.
I caught the better end of 30 flies the first night, and over the next few days, this sneaky little trap killed at least 100 more. Every time the suds died down, I closed the jar and shook it up again, adding soap or vinegar as necessary and replacing the solution a time or two until I stopped finding bugs in it, which took maybe three or four days.
I don’t know the blogger over at Suburban Turmoil, but I definitely owe her a beer for this excellent solution to a really annoying problem.