I made 5 traps, using the method outlined in my previous blog post about fruit flies.
These traps consisted of:
Trap #1 - My "control" trap, using fruit & yeast (which I've used for years)
Trap #2 - Apple cider vinegar & yeast
Trap #3 - Apple cider vinegar only
Trap #4 - Apples only
Trap #5 - Apples, apple cider vinegar & yeast
After 48 hours, still only one trap contained any fruit flies, which now numbered somewhere between 20 and 30 (they wouldn't stay still so that I could count them!)
I figured that the experiment could be stopped at that point, since there was a clear winner: you probably guessed it, it was Trap #1 (my old standby), containing apples and yeast. The other traps didn't even have one fruit fly in them, nothing, nada, nil.
So there you have it! My original recipe still stands.
Happy trapping!