Curious to find out how effective these are. I still only use the fly traps. Purchase some, and use my home- made ones. I keep about 5 in separate areas, and they do trap a gazzilion flies.
I use the large sized fly trap bag thing's too. It fill's up pretty fast, but there's some flies that seem to not find their way over to it. If these fly predator thing's work, I'll need to try to figure out how to breed them myself instead of having to buy a new batch every month like they say?