Did you put a culture in the enclosure or just the flies? How long were you gone?
I create smaller cultures for when I'm going out of town. Instead of leaving the lid off, I cut a small hole in the cloth lid so that the flies can come and go. I create them in advance so that I have larvae, pupae and flies in the cultures so that more flies will hatch while I'm away.
I create smaller cultures for when I'm going out of town. Instead of leaving the lid off, I cut a small hole in the cloth lid so that the flies can come and go. I create them in advance so that I have larvae, pupae and flies in the cultures so that more flies will hatch while I'm away.