does any one know how to build horse fly traps?

Answer 1

http://www.muextension.missouri.edu/xplo...
http://ipm.ncsu.edu/current_ipm/99pestne...
Pheromone traps are simple jars with one-way lids. The traps are placed in barn areas where flies hang out. A small amount of pheromone solution, a natural substance to which flies are attracted, is placed in the jar, The flies buzz into the jar, can't get out and die. Traps are sold by different companies under various names such as Trap-A-Fly, Venus Fly Trap and Fly Terminator. They can be ordered from most farm or vet supply catalogues such as Jeffers, 1-800-533-3377.