The Sticky Thrip Leafminer Traps do the following things: Protects plants from Thrips and Leafminers. Excellent protection for roses. Hang at plant level. Place traps every 7 feet apart or at end of each row. For badly infested plants, shake gently and flies will swarm a few moments before they fly to your nearby trap. Lasts all season, even in rain, or until completely coated with insects or dust.