Get a magnifying glass so that you can watch your predator mites. They remind me of the velociraptors from Jurassic Park. Spider mites look like cows with a mosquito proboscis. The predator mites are much faster, and take bites out of the spider mites as they run by them. It seems like the spider mites have no defense at all - but their defense is their massive amounts of eggs that seem to hatch out in staggered fashion. The predator mites eat all the living spider mites, but die or wander off before the final round of eggs has hatched out.
Hot Shot No-Pest Strips will kill spider mites, but not everyone wants to be around a chemical pesticide.
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