The Patuxent Wetlands Park is a lovely setting in Anne Arundel County, Maryland where vibrant tidal wetlands give way to the Patuxent River. It is a place where the community enjoys fishing, boating and nature. It is also the site of one of the 500 purple, prism-shaped traps hanging high in Maryland ash trees this spring and summer. The purple traps help State and Federal officials to uncover signs of the invasive, tree-killing emerald ash borer (EAB) beetle.