Small fibers

Hell I have a tea tree and a chinese elm, they were doing very well, now they have thin fibers all over them, if i look in the soil there are very very small bugs crawling. what can I do to get rid of them, will my trees die if they left?

I forgot mention that the two trees are in my house

"thin fibers" like a spider web? What color bugs? Do they have 6 legs? Do they have wings? Do they crawl? Hop? Move quickly? Slowly?

How wet is the soil? How much (rough percentage) of it is organic material?

Both of your trees will be MUCH better off outside during warm weather. Chances are once they're outside the problem will get better.

Can we see a picture of what you describe?