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Hi All,

I was previously under-watering my tree for a couple of months so it was pretty sparse. But about 2 weeks ago I started watering twice a day and since then there has been a LOT of new growth. But I am noticing some of the new leaves are covered in these reddish spots. Not all of the new leaves have this. Does anyone know what this is?

Thank you for any information.

It is a Chinese elm, and I have had it for about 5 months total, and it lives indoors (by a large window) at around 70 degrees F.

Far too hot and inside it will just deteriorate, if it lasts through the winter you will be lucky. It needs to be outside preferably, but if you have low temperatures then a COLD room will help. there is nothing wrong with the leaves, yet.

Do you think it might be mites? I didn't think to mention this but there have been like what looks like tiny white cat hairs all up in the leaves. I thought they were literally cat hairs but now I am thinking it might be mites.

I don't know about the red spots.

On those new leaves i don't see mite damage. Make a few picutres of the older leaves to determine that.
Did not see webs, but did see a fluff and a few hairs.

And if looking for mites, then look for spots like the picture below, those mites are real small and hard to see without magnifier.


About temprature, to give a good anwser we need your location and season your in. If winter, i would place it in a unheated room infront of a window. 50to60F

If you live in the northern hemisphere you are facing som difficult problems going forward. Trees dont grow in winter, thats a fact. If yours do its a problem. It is now emptying all its resources on leafs that will not last until spring. In spring it will not have much energy left and might not survive. Get it in cold dormancy as soon as possible. 5-10c is enough to stop it from growing.

All eventually problems with new leafs not looking perfect is less important right now.

Okay, seasonal problems aside. Here are some pictures of older leaves on the tree, and one picture of the hair-like fibers that are all over it. If anyone knows if this could be mite related let me know.






I was assuming these spots were from lack of water but the new red spots on new leaves have me questioning it and thinking mites.

As for the seasonal issues, it is currently winter in Minnesota. Since it is an indoor tree, why do seasons impact it? I admit that it is dry in here but since the tree is close to a window its probably closer to 60F where the tree sits.

There are no such thing as indoor trees in the meaning thrives in living room conditions. The term indoor is used by the industry for trees that might need some protection in winter.

Yes, it could be mites. But that is no problem. When you get the tree into proper conditions the mites will go dormant.

How season affect an indoor tree? I think that was answered in my last post. It grows in winter! Totally unnatural.

That directly contradicts what I have read about Chinese Elm trees, which is that they are perfectly capable of living indoors year round.

You did not explain why seasons would affect an indoor tree at all. My understanding is that trees go dormant in order to survive harsh cold or lack of sun, because they cant survive the conditions otherwise. If the tree has sunlight and warmth year round, then how do they benefit from dormancy? Genuine question.

I would be concerned putting the tree outside now when temperatures frequently go sub-zero.

This is besides the point though, I just want to know if anyone has any insight about the spots, because I want to make sure the tree isn't infested.

4Cats wrote:

That directly contradicts what I have read about Chinese Elm trees, which is that they are perfectly capable of living indoors year round.

You did not explain why seasons would affect an indoor tree at all.

Living room condition 70F will give the tree the idea it is spring and summer. While the season outside is winter, so there are less hours of light, and less intensity. That means it will get reduced energy / suger production. New growth will go streching out, so internotes get longer. leaves will get weaker, as it draws old energy from the trunk and branches. And getting more deceptible for infestation or deseaces.
Thats why in winter, you put them colder away, so they go kinda dormand, to preserve there energy reserves until it is spring and it has the right condition to grow propper.

Well, trees have evolved thrue thousands of years to the conditions. Dont ask me why trees that needs dormancy needs dormancy. I just know that they do.

Its funny with chinese elms that there are so many references online saying they can grow indoors all the time. Its a semi decidious temperate tree. Not at all a tropical tree. I havent seen one thriving indoor elm ever. However I have seen hundreds suffering.

You are right about not putting it outside now. If it hasent slowly and naturally been used to subzero temperatures that would be a chock that most likelly kills it . That is also why I say 5-10 c is the best option here.

I dont think that anyone can give you a clear answer about infestation based on those pictures. What you need is a magnifier and look for pests yourself. It is possibly an infestation, trees that suffer tends to attract all kind of pests. Dont treat for anything before you know there is an infestation going on.

Over all, the best knowledge you need now is biology of the chinese elm and the possible pests. Lower temperature will be for the trees gain two times if there are an infestation going on.