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I heard that the chickens would eat the fly predators and it would be a waste of money. I was using them last year where I keep my horses but didn't see a huge difference.
I've been using them this year and so far they are working great. The past couple of years we have had clouds of flies, in our egg packing room, in our garage, at times in the house. In May, before the fly season started, I ordered fly predators from Spalding Labs. They send me a shipment every month throughout the summer to spread around. I don't necessarily put them where the chickens scratch. I put them in the area under the roosts (basically a manure pit) that is fenced off from the chickens, I spread them around the compost piles, I spread them in our garden that is heavily mulched with lawn clippings.
The flies breed in areas of damp manure or damp, rotting vegetation. I've been minimizing these areas and spreading fly predators and so far the results have been quite dramatic. I'm crossing my fingers that it holds out for the rest of the summer, as August is usually our worst month.
Do you use DE? I am concerned that since I use DE in my coop, it will kill the fly predators.