Almost all brugs get mites @ one time or another. Some varieties more, some less. Just buy you a good miticide like Forbid and use it before the mites take over the plant. I'd strip most of the leaves before treatment to get rid of as many as possible. I've never seen mites kill a plant.

Do a little research on mites so you will understand how they attack the plant, their life cycle, etc.

Come to my house and you'll see dead Brugs. from mites.
Where do you get this Forbid? Is it as expensive as 'Avid'?
I think thats what its called. I only need like a teaspoon to make enough spray for a season. But they only sell it in like 1 lb bags for like $40! Is this Forbid the same? Does Lowes or Home Depot sell it?

I'll take your word on the dead plants, but I've never seen it. Forbid is similar to Avid, both translaminar. Yes, it's expensive. I buy both in liquid form and rotate them with each other. You can buy them from ebay or most gardening sites that sell chemicals. Seems like I paid around $280 for 8 ounces for the Forbid. It's very expensive but it works. I have lots of plants and I like to keep it on hand. I do think if you'll keep an eye on the plants and when you see the mites starting up, pull off most of the leaves and then blast the rest with a hose. Are you talking about regular spider mites or broad mites ? Broad mites can be very difficult to kill if they are all over the plant. Hope this helps.