Best Management Practice (BMP) for controlling dirt daubers (also known as dirt dobbers or mud daubers) around homes and structures:
Identification
Dirt daubers are solitary wasps that build mud nests on walls, under eaves, in sheds, garages, and attics. They are not aggressive and rarely sting, but their nests can be unsightly and attract spiders.
Prevention & Mechanical Control
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Seal Entry Points
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Inspect and seal cracks around windows, doors, soffits, and attic vents with caulk or expandable foam.
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Use fine mesh screens over attic and wall vents.
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Remove Nests Early
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Scrape off fresh mud nests using a putty knife.
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Do this in the early morning or late evening when wasps are less active.
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Clean the area with soapy water to remove scent trails.
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Reduce Attractants
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Minimize standing water (mud source).
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Keep garages, porches, and sheds clutter-free to reduce nesting spots.
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Close garage doors when not in use.
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Chemical Control
Residual Insecticides (for surfaces where nests commonly form):
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Active Ingredients:
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Lambda-cyhalothrin (e.g., Demand CS)
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Bifenthrin (e.g., Talstar P)
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Deltamethrin (e.g., Suspend SC)
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Application Guidelines:
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Spray under eaves, around doors, window frames, and other nesting surfaces.
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Reapply every 30–60 days, especially in spring and summer.
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Avoid applying near pollinator plants.
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Spot Treatment for Active Wasps
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Use aerosol wasp sprays labeled for quick knockdown "PT Wasp-Freeze II 0.1%....Prallethrin 14 oz Aerosol ( BASF )" for visible adults.
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Always spray from a safe distance and follow label instructions.
Long-Term Tips
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Install fake wasp nests (decoys) mud daubers tend to avoid nesting near others.
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Paint surfaces with smooth or glossy finishes; mud sticks better to rough textures.
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Regular inspections monthly checks during warm months help catch problems early.
Contact BES-TEX Supply at 325.653.1300 or visit us at 4512 Adobe Dr., San Angelo, TX for products and advice tailored to your situation.