post powder bettle

[Thomas Dionne]

I just picked up a house that has a lot of these post powdered beetle holes in the floor joist. You can only see it from under house in crawl space. 

It came back in inspection and I got a good discount for them. The house is structurally fine and its been treated for all pest. 

Problem is I still have all these pin size wholes in joist that bother me and could be a problem on a wdo down road. 

It would be ludicrous to replace all the joist as they are all over so im wondering what people do? I was thinking of a spray foam insulation.  But it just seems like either I rent it for ever or do something about this.