Unbaited Pherocon AM traps measure 9"x11" unfolded with a 7"x9" sticky grid. Use for: Pear Psylla, Corn Rootworm, Flea Beetles, Pear Thrips, Greenhouse Whitefly, Walnut Husk Fly, Fungus Gnats and Aphids. Replace every two to three weeks outdoors. Package of 25 traps.