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Q&A Home

Nick writes,

Can I use insecticide granules in my crawlspace?

I have an ant, earwig, and spider issue in my new house. I have sprayed around the yard, but they still seem to be getting in. I would assume that the only other place is under the house in the crawlspace. If I were to retreat the yard with granular insecticide, could I also use it in the crawlspace for added protection? If so, which would be the best kind?


You would not want to use granules under the crawl space of the house.  The reason being is granules require moisture, either from watering or rain, to release the insecticide that kills the insects.  You should always water in the granules after application especially if you are in an area with little rain and moisture.  This may be why you are not getting good results already in the yard.  Since rain will not make it in the crawl space, or at least it should not be, granules are not good for under the house.  In addition to applying granules in the yard and watering them in, you should apply a liquid insecticide, specifically a wettable powder around the perimeter of the house and underneath the house.  Wettable powders are easier for spiders and other insects to get on their bodies typically and are faster acting.  Our most popular wettable powder product is Demon WP and it can be applied using a hand pump sprayer.

Answer last updated on: 07/09/2011

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