I have a lot of big black ants walking up and down a fence post attached to my house. It looks like they're crawling into a joint where two boards meet and there is a lot of sawdust coming out of this joint. I think these ants have done damage to the wood there but before I do anything I'm wondering if I should be prepared to spray something. This joint is only 5 ft from my house and if I don't do anything, I'm sure the ants will get into my house.

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