Need advice on how to save my fukien tea!

Skout41

I am new to bonsai and about 3 weeks ago I purchased a new fukien tea. After checking the roots I realized that it needed repotting pretty badly. So I went back to my local nursery and purchased a larger pot. I trimmed all of the dead and old roots back until all that was left was healthy roots. I followed the instructions in my book to repot it. I then wired it in place and gave it a good watering.

The first few days after repotting many of the leaves started to turn yellow and drop. Some of the new shoots began to look limp. I figured that this was just normal shock from repotting. However, now it has been a week since I repotted it and it is still not getting better. Most of the leaves are a yellow looking color and have small brownish black spots on the bottom of them. It has lost nearly a third of its leaves and the ones that remain are not looking healthy. After giving a thorough inspection I saw very fine little webs going between leaves and between branches. this led me to believe that it could be spider mites. Are the brownish black spots on the bottom of the leaves a common sign of spider mites, or could this be something else? If you believe that it is spider mites, how should I go about getting rid of them?

By the way the spots range in size anywhere from a tip of a ball point pin to the size of a pencil eraser. Most of them are the size of a ball point pen though.

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Skout41

When I say ball point pen I mean the tip of the pen where the ink comes out.