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Brian from Norfolk, Va writes

How often should I apply Demon WP to control predator spiders (possible brown recluse) in my crawl space.

My house has been attacked by predator spiders above and below. Spiders from the attic and spiders from the crawl space. Possibly brown recluse, but everyone says I'm outside the recluse zone. Nonetheless the spiders have a fiddle on their backs. Young spiders are emerging from the crawl space vents and biting my family. None are trapped in glue boards. My hope is that Demon WP will annihilate them. I plan to spray the crawl space walls and the exterior of the HVAC duct lines. I'm hesitant to spray the moisture barrier, but possibly the perimeter of the crawl space and the perimeter of the air vents.


Demon WP can be reapplied one timer per month for indoors and outdoors for spider control. You will want to use the higher usage rate to start (2 scoops or 2 packets per gallon of water) for the fastest kill and the longest lasting results. Be sure to trim back any tree branches that over hand your home or bushes that are touching your home to remove possible harborage for spiders or their prey insects.

Answer last updated on: 01/12/2013

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Demon WP - 1 lb. Jar

Demon WP - 1 lb. Jar

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