Not all wasps are out to sting you — and the mud dauber certainly isn't. Here's why these scary-looking bugs boast benefits in your garden.
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Mud Dauber Wasp Identification
Identifying mud daubers isn’t too tricky if you know which features to look for — and especially if you can spot a nest. The most striking feature of this bug might be its straw-thin waist, which connects the abdomen to the rest of the body. Leg colors can vary slightly, with some subspecies boasting yellow legs (yellow-legged mud dauber) while others have black legs (common blue mud dauber) or slightly yellow hind legs (organ pipe mud dauber).
Body coloration can vary, too, with some mud daubers bearing a resemblance to yellow jackets while others, like the common blue, have metallic bodies. Regardless of subspecies, these insects range from 1/2 inch to 1 inch in length. They have six legs and two wings. Because other wasps can resemble them, the best and most straightforward way to identify one is to get a look at its nest.
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What Do Mud Dauber Nests Look Like?
As their name implies, mud daubers build their nests from mud. Females are responsible for nest construction. Typically, the female builds her nest on an open structure, such as the eaves of a house, a cave entrance, or in a barn. The wasp removes mud at or near a puddle and carries it, in balls, to a chosen nest site. From there, she shapes a nest with multiple sections.
An egg is laid in each chamber, along with paralyzed prey. The female wasp then seals off each section. When the larva hatches, it consumes the other bug (usually a spider). Larvae overwinter in cocoons and emerge from the nest the following spring, after reaching maturity.
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Will a Mud Dauber Wasp Sting You?
While humans have learned to associate wasps with painful stings, that’s not true for mud daubers. These insects very rarely sting. Because they work alone rather than in a group, they don’t swarm in defense of their nests the way non-solitary wasps, such as yellow jackets, do. While mud daubers possess the ability to sting, they are unlikely to cause harm to a human and pose very little threat under most circumstances.
Keeping these wasps around, however, provides definite benefit. Their nests aren’t exactly photogenic, but mud daubers provide a valuable service in feeding on spiders and keeping populations low. Especially in areas where black widow spiders are a problem, mud daubers assist in keeping their numbers in check. Unless a nest poses a clear danger, it’s often best to leave it alone.
Next find out how to identify a thread-waisted wasp.
Sources
- Purdue University Extension – Entomology, “Mud Daubers“
- Missouri Department of Conservation, “Mud Daubers“
- Iowa State University Extension and Outreach, “Mud Dauber Wasp“
