Tech Notes

Spider Control

Spiders are eight-legged arthropods that can become nuisance pests when they are found around residences and businesses. Though most spiders are harmless, a few species, such as the Brown Recluse, Black Widow and Yellow Sac spiders, can inflict dangerous bites.


The application of insecticides for control of spiders can be an effective tool in reducing the incidence of these annoying intruders. When making professional insecticide applications for spider control, it is important to remember the following points:


Ø      Most water based sprays will not stick to spider webs so spraying the web will probably not result in control of the spider. Before treatment, use a small broom or vacuum to remove spider webs.  Pay particular attention to areas around entry ways, patios, and windows.

Ø      The returning spider will generally try and reconstruct their web in the same location.  Direct a surface spray to the areas where the webs were attached to the structure where the spider may return and encounter the treatment.

Ø      In areas where webs aren’t present, target sprays to probable spider harborages around doors and windows.

Ø      The spiders are present because they are feeding on insects around the building. Help eliminate that food source with a general perimeter application to reduce insect levels.

Ø      Microencapsulated insecticides, such as Demand® CS and Demand® EZ with iCAP technology, stay on top of porous surfaces and adhere well to the spiders legs.  Wettable powders, such as Demon® WP, a proven performer for control of spiders, will also maintain effectiveness on porous surfaces.


If the spider infestation is serious or spiders are found indoors, work with the property owner to implement Integrated Pest Management procedures to reduce or eliminate the infestation.  These could include:


Ø      Sealing cracks and openings around the structure, inspecting and repairing screens on doors and windows.

Ø      Using sticky traps to monitor spider activity and trap spiders indoors.

Ø      Removing spiders physically by vacuuming webs and spiders from harborages. Be sure to seal and dispose of the vacuum bag immediately.

Ø      Redirecting outside lighting to draw insects away from the building, reducing spider food sources.

Ø      Modifying the habitat by changing landscaping, cleaning away debris, moving woodpiles, etc.

Ø      Reducing indoor harborage areas by removing boxes and other stored items.

Ø      Applying residual insecticides to harborages, attics and entry areas.

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