Past studies on the behavioral mechanisms of mating disruption have been conducted in a setting where the densities of male and female moths are unregulated and unknown. Conducting such studies in large field cages using released moths offers advantages similar to knowing the concentration of enzyme and substrate in enzyme kinetics studies. We will describe and document a system for constructing replicated 9m high x 21 x 21 meter field cages over plots of 12 apple trees. The support system is 10 cm diameter poles and high-tension trellis wire. The netting is white 40% shade cloth. All codling moth, Cydia pomonella, males released into these cages flew immediately to the top half of tree canopies. More than 75% or the 48 released moths per cage were recovered within 3 days in a sticky trap baited with a 0.1mg codlemone lure. Simultaneous release of females with males depressed the rate of male catch significantly as did deploying various densities of pheromone dispensers. Explanations will be offered on how such a system of large cages can be used to unravel how mating disruption is actually being mediated.