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The Pest: Mud Daubers . . .

Mud daubers are long and slender, usually black in color, and may have pale markings or a metallic luster.
Open Pipe Mud Daubers
The nest: Mud daubers are solitary wasps and do not live in colonies. Females construct nests of mud. Many short mud tubes, usually about 1 inch long, are constructed side by side. They frequently build nests under eaves, porch ceilings, in garages and sheds, barns, protected building walls and attics.

The threat: Mud daubers are considered beneficial insects because they control spiders. However, if their nest is located near human activity, control is warranted.