The oriental beetle (OB) is the most important turfgrass insect pest in New Jersey, Connecticut, Rhode Island, and southeastern New York. Our objective is to develop mating disruption technology for OB management. Field trials in 2002 through 2004 using sprayable OB sex pheromone formulations resulted in up to 87% reduction in trap captures of OB males and 74% reduction of OB larval population. Because the effect of the sprayable pheromone formulation declines after about 14 d, two applications during the flight period were necessary for effective mating disruption. Shoes walked through treated areas were also contaminated with the pheromone and attracted OB males in untreated areas. Because of the limited efficacy and persistence as well as the contamination issue of sprayable formulations we are now developing dispersible OB pheromone formulations. We tested three different newly developed dispersible formulations each at 5 g and 20 g ai/acre applied once just before the onset of major beetle flight in a small plot experiment. There was no significant effect of pheromone rate on the number of OB trapped. The formulations produced by Suterra and ChemTica provided significant reduction of trap captures during most of the major flight period, resulting in 78% and 79%, respectively, reduction in total captures. A formulation produced by USDA provided significant reduction in captures for only 14 days, resulting in a 60% reduction of total captures. These results are very encouraging as only slight changes in two formulations and in the application techniques have the potential to improve mating disruption to highly effective levels with one single seasonal application at economic rates. During 2006 we will test improved formulations in large plot experiments, and examine whether the dispersible formulation could contaminate shoes, the latter being highly unlikely.