Many people are interested in swarm traps this year. It seems there are many questions like how to build, where to place, what to put in them, and so on. Of course someone here will answer all those questions. But may I suggest for those who are setting out swarm traps, an excellent book on the topic. It covers swarming, control, causes, prevention, etc. It is a collection of articles that include some really great research from Cornell University. The book costs $5.00 and that included shipping the last time I checked. You can get it from Root publications by calling 1-800-289-7668 and asking for item #X56 called swarming.