What kind of flies are they, what temps are they kept at, do you see tiny white dots moving on the inside of the cup (etc. TBD)?
You'll want to find a way to get the temps up to about 80 for the flies to increase production. At those temps it will be at a crawl.They are melos and I do see the little white dots you are talking about. They are kept at room temp (66-68 degrees F).
The whole last pgh. I wrote just above.Thanks for the info. What is the best way to combat mites?