The Mud Dauber Wasp gets its name from the fact that they construct their nest of mud. They are typically a nuisance pest, building their mud nests on sheltered sites like eaves, porch ceilings, garages, sheds, barns, open attics, or any protected wall or structure. The Mud Dauber Wasp is recognized by its ½ to 1 inch very slender metallic black body. The nest looks like a clump of mud stuck on to the side of a structure and as the young adult Mud Daubers emerge from the nest they leave small holes in the nest, showing the nest is old or inactive. The Mud Dauber Wasp does not defend its nest, and only rarely stings. These wasps are beneficial insects and help control spiders. If control is needed, first treat and control the female Mud Dauber Wasp and then remove the nest from the structure with a putty knife or scraper. Activity can be discouraged in a given area by an application of a microencapsulated material on the structure.