I’m sure some of you are interested to find out how my fruit fly freezing trials have been going. Well, the long and the short of it is that I am now quite convinced that freezing food waste (in my deep freezer anyway) does indeed kill off fruit flies, larvae and eggs.
My second trial involved filling a big ziplock bag with food waste that was clearly overrun with fruit flies (it had been sitting in a bag out on my deck for quite some time, and clouds of fruit flies would emerge any time I opened it up for a look) and then tossing it into my chest freezer. This time around, I removed the bag from the freezer within a day or so, opened it up, then put it into the cardboard box I used for my first trial (the idea being to allow the contents to “breathe”, while preventing any fruit flies from getting in).
When I checked on the box a couple of days later I was intrigued to see a small cloud of fruit flies circling it. I thought for sure that the material inside had become a breeding ground. When I opened up the box, however, there was not a fruit fly in sight. Clearly, the fruit flies in my house had been drawn to the box due to the tempting aroma, but had not been able to breach my defenses. Just to be safe, I popped the bag back into the freezer for another day before letting the bag sit out again. Recently, I went so far as to leave the bag open to see if I could get some of my own fruit flies to breed in the material, but haven’t even had any luck with that (seems the number of fruit flies in my house has dropped considerably). I will likely try leaving the bag outside for a few days for the sake of seeing how quickly fruit flies could colonize it if given the chance. But, all in all, I’d have to say I’m still thinking that freezing is a good way to get rid of them.
That being said, if anyone tries this out for themselves, please do let us know how you make out! If I wanted to be really thorough, I might try putting bags of infested waste in my refrigerator and in my smaller freezer (sitting above the fridge) just to see how the fruit flies fare in those situations. I’ll let everyone know if I decide to do so.