Why 6 months?

[d_virginiana]

Happens in my frog's cage all the time when crickets die. If you leave poo or dead food around for more than five minutes even in the middle of winter, a fruit fly will magically appear so that it can spawn in your reptile enclosure

[PINJOHN]

I think you have nailed it with the fruit fly's, i used to keep a wider variety of reps some lizards and more amphibians than i do now and usually had several wingless fruit fly cultures on the go, the problem was the wingless cultures would occasionally die off unexpectedly, but the wild flying type could be expected to turn up without fail as if appearing from another dimension [oops there go,s my over active imagination again] all they were intent on doing was finding somewhere to host their pesky eggs/maggots, yes they are actually maggots as apposed to worms

[kibakiba]

They die off unexpectedly because they only have a lifespan of 7-10 days. If they hatch all at once, they may die all at once.

[Mommy2many]

I hate fruit flies.
Almost as much as I hate pantry moths. (which by the way, I finally found the source of and obliterated).
And Jesse, I did not use my dyson in the end!

[kibakiba]

I also hate them, but the wingless and flightless ones are okay... as long as they're only in the vial... Or my frog's belly

[Mommy2many]

These have been hovering around me and the computer.

[kibakiba]

I clap my hands over them softly to knock them out, then put them in a cleaned out altoids tin.... I save them for a later time when I don't have food for my frogs