It is proposed to significantly reduce blackbird populations that have established winter roosts at Fort Campbell, Kentucky, and Milan Army Ammunition Plant (AAP), Tennessee. Blackbirds from these roosts have caused significant agricultural damage in Christian and Trigg counties, Kentucky, and Montgomery, Stewart, Gibson, and Carroll Counties, Tennessee. Additionally, these blackbird roosts have been linked with histoplasmosis-positive soil samples; tree mortality; and offensive odor, noise, and unsanitary conditions at the military installations. At Fort Campbell, vast flocks of these birds cross the airfield twice daily, interfering with aircraft operations. This action is planned to be accomplished by treating the Fort Campbell and Milan AAP roosts with Compound PA-14, Avian Stressing Agent, a biodegradable wetting agent.