I was reading thru this and wondered why no one mentioned the sticky fly strips, and here you are. I have used these for years, hang them from the rafters, when they are almost full just dispose them in a plastric bag. Works great and cheap, you can order them from Amazon if you cannot find them. I also use a drop board and clean it every day, really helps with the fly problem.I use those ugly sticky fly strips. Work like a charm.