Spraying with horticultural oil may help a little, but the only systemic I know that works reliably is Avid, and it's expensive. I bought the smallest bottle I could online and it was 8 ounces for about $90...which makes up about a 10 year supply for me because it's highly concentrated. It contains abamectin, which is not a poison per se, but a reproduction inhibitor. You do have to be careful as it also can hurt bees. I dilute it per the instructions and add a few milliliters of horticultural oil.

I did a quick search on Google ("spider mites" +Avid) and here is one place that sells it. I know nothing about this company, but at least you can check out the info:

Avid

Thanks Kudzu9, is this a spray or do you drench the soil? Also, did it work for you?

I have heard great things about Liquid Ladybug for spider mites :) ... just my 2 cents.

Here is a link that might be useful: Liquid Ladybug

They're definitely spider mites and not bamboo mites?

Visit Clinton Bamboo Growers and ask what they do, they have people bringing in infested material and asking them about it - with the result that they have to constantly take control measures to keep their stock and display plantings looking good.

Nice place to go and look at bamboo anyway.

When I was told what they were doing some years ago it involved applications of more than one product timed to kill more than one stage of the mite life cycle.

Also try Googling bamboo mites or mites bamboo.