In my experience with Spider Mites, they are nasty critters! I have had good luck using Malathion. It is product that smells really bad, but seems to do the trick after a few treatments. It is definitely not ok for use on edibles though, so don't treat anything but ornamental plants with it. I forget what the instructions say exactly, but mix the recommended amount in a spray bottle and throughly spray the plant at least once a week for about a month. You could do it twice if you want. The goal is to eliminate the hatchlings as the eggs hatch. The hatched mites will die, but eggs will survive, which is why you need to keep treating. Also please spray outdoors or in a bathtub, as this stuff really stinks! Good luck!
Oh yeah, do you see any little bits of webs in the corners of the leaves or anywhere else? That would confirm they are definitely spider mites. However if you don't, the Malathion will treat most pests anyway.
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