Fairy Infestation 3

My in-laws are vacationing in Costa Rica right now, so I stopped by their house to make sure everything was in order.

Anyway, while they've been gone, fairies have apparently infested their garden. I'm really at a loss as to what do to. As you can see from the photos, they're very much established and clearly expanding...I'm not sure what I should do... borax? Diatomaceous earth?  Or maybe I should just pretend I never saw any of this and leave it to my in-laws to deal with?

Boy, my mother-in-law is going to be in for a surprise when she gets back, right around Mothers Day too.

View the rest of the evidence here:

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