Mud Daubers in Phoenix, AZ
Sceliphron caementarium
Mud daubers build distinctive tube-shaped nests but are rarely aggressive. Learn how to identify and manage them.
Notes: From a Phoenix, AZ Exterminator
Appearance
Mud daubers are slender, black or blue-black wasps, often with a distinctive thread-like waist, measuring about an inch long.
Harborage
They build hardened, tube-shaped mud nests on eaves, garage walls, and under patio covers — often mistaken for a more dangerous pest due to their unique nest shape.
Are They Dangerous?
They're solitary and rarely sting unless directly handled, making them one of the least aggressive stinging insects on this list. Their main downside is unsightly mud nests on exterior walls.
Treatment
Nest removal and exterior treatment prevent them from returning season after season. Antidote Pest Solutions removes existing nests and treats to discourage rebuilding. Talk to one of Antidote Pest's Service Pro's to keep your exterior walls clean.
Prevention Tips
Inspect eaves, garages, and sheds for tube-shaped mud nests, especially in spring
Knock down and remove old nests before wasps return to reuse them
Seal gaps in eaves, soffits, and open structures like carports
Reduce standing water and mud sources near the home
Screen off open areas like porches and patios where they build
Behavioral Notes
Mud daubers are solitary wasps, not colony builders — each female builds and provisions her own nest alone, unlike social wasps such as yellowjackets or paper wasps.
They provision their mud nest cells with paralyzed spiders (often including black widows) as food for their larvae, making them a natural, if unintentional, form of spider control.
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Frequently asked questions
