do fruit flies neeed light when producing?
I actually noticed this myself, a few times since I had to move my cultures to a cooler place (used to be in the same room as the heating system), but never considered light being the cause. But sure enough, checking some newer cultures, the side away from the light is the one covered in pupai keep mine in almost complete darkness. i find they produce better in the dark. one time i left a freshly made culture next to my frog rack and all the casings were on one side of the container ( away from the light ) at that time i decided to move all my cultures to complete darkness and they produce much better. but i do also get good results in standard room lighting where i use to keep them on a smaller shelving system next to one of my racks.