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I do not know for sure if the worms are?a pest, but the condition of my bonsai started to deteriorate when I noticed them in the humidity tray. My bonsai was doing well before the worms showed up. To be clear, I am not doubting that the environment could be a factor in its deterioration, but it seems oddly quick to?be the only cause when it was doing well. Regular watering and pruning, being placed on a windowsill that gets plenty of sun,?and using a?humidity tray seemed to be enough. As for the "myth,"? this website says it can be kept indoors and outdoors. It also?says?Chinese elms should be in a frost-free environment, so how are they supposed to experience a dormancy period in the winter?

Do you think it is oddly as well that we get several threds like this about suffering or dieing indoor elms in late authum and during winter??The exact time of the year when the trees go dormant in their natural environment.

When a tree slowly dies, what happens under the soil reflect what is happening in the canopy. Roots are dieing as well. That makes a lot of new food for detrivors. I thing the worms was there all the time. But now they got an increase in food supply and started to multiply.

So the detoriation and the worms have the same cause and therefore happened at the same time.

Regarding what this site sais about growing chinese elms indoors, you may need to read it again. It can be cooked down to this two statements:
Outdoors in summer.
Cold but frost free room in winter.

It may be confusing for a beginner. But indoors do not mean livingroom conditions. If you are in usda zone 7 or higher you do not need to worry about taking it indoors in winter. You will be more successful keeping it outdoor all year.

I understand. Does that mean the humidity tray is useless, then? Do I move the humidity tray outside with the bonsai or is it only an indoor thing? How do I know what counts as deterioration or dormancy behavior??

Humidity trays are useless outdoors as well as indoors. Just get yourself a simple humidity meter and discover it for yourself.

Dormancy is when the tree are not growing. Suffering from little light and to hot in winter is shown in long leggy growth. Called elongation.

A tree that has not gone throe the autum outdoors cannot tolerate frost. Your best bet is 5 degrees until spring.

What do you mean, "five degrees until spring"? How can it survive the winter if it cannot tolerate frost from being inside? Does that mean if I leave my bonsai outside year-round that it can tolerate frost??

Imperial? This is an international forum and we use international units. What I mean is 5 degrees celsius.

Yes, if you are in usda zone 7 or above the tree can be outdoors all year. Moving from indoor to outdoor in winter is another story, it will die.

So I should bring it inside for the night if the temperature is below 5°C? Or is there something I could do to protect it outside??

5C is not cold. No do not take it inside if it is as high as that. Chinese Elms are hardy, they will withstand as low as -10C as long as they are acclimatised if they have been kept inside. As you have had yours inside you need to acclimatise it gradually, if you had left it our all year it would have been fine. It would be better to pot it in a shed or garage rather than in a house. It is not cold in the UK at the moment, unless you are in the north of Scotland.

PresidentTree wrote: So I should bring it inside for the night if the temperature is below 5°C? Or is there something I could do to protect it outside??

Do not move it back and forward. Then you will have higher temperature at night than in the days, which is the worst stressor.

5c is 5c. You can get 5c by heating an enclosed area outdoors, like a shed, greenhouse or cold frame. You can also get it in a room indoors if you turn the heating down.