Oak Stump Fly Trap This trap is more effective because its' UV-enhanced color and powerful, patented bait draws pest flies of all types! Remove bait pack and trap hanger. Pour 1/2 a cup or more warm water into bottom of trap and add bait packet. The The patent OakStump Farms bait generates active attractant for house flies, blow flies, garbage flies, and other pest flies. Place a small piece of protein (raw hamburger) in the center of the gate for greater attraction. Wash and replace bait when full or at least every 7 to 10 days (sooner in hot summer temperatures). Re-usable, Non-toxic, Safe for the environment. 261001 Oak Stump Fly Trap (.3#) $6.95 qty: