Problem with my small apple tree

[Kubut]

Please help. This little apple tree was growing well at the beginning and now since about 2 months those brown patches appeared on all leafs. Even new leafs grow with them already on. At the underside of leafs there is a fine like spider web. Really tiny. Don't know how to treat this and cannot find anything online. Feels like this plant is dying

[veggiechicken]

Hello and welcome!
Is your apple tree in the house? It may be too hot and dry for it.
Where do you live?
My outdoor apple trees have shed their leaves now so I'm surprised to see so many leaves on yours..

[Bigmallly]

Could it be: Fruit tree red spider mite (Panonychus ulmi (Koch)) - Apple Best Practice Guide

[FB.]

Could be powdery mildew. It's a fungus that likes high humidity in the air but low rainfall and that looks to be the conditions you've provided.

I'm guessing you grew it from a pip? Not all seedlings are fortunate enough to inherit strong disease resistance. Commercial varieties are often susceptible and that's likely to be passed on to their offspring.

Unfortunately, I suspect your apple will eventually die.

In any case, it won't like being indoors in a window forever because it won't experience the four seasons that are necessary for it to behave normally.

Probably your best chance of growing seedlings which might be lucky enough to inherit mildew resistance would be to grow pips from varieties such as Worcester Pearmain and Discovery but even their seedlings may be overwhelmed where conditions for mildew are perfect.
Triploid varieties often have very strong resistance to mildew but unfortunately most of them produce very few seeds or have a very high proportion of seeds which don't germinate.

[Mark_Riga]

I think it would like to go out for a bit of fresh air if you have somewhere safe for it? Away from anything like a rabbit as the top growth looks quite tender.
You could plant it out of the pot or may by sink the pot in the soil to protect from frost but be able to bring in if a hard frost is forecast. If it survives and thrives, you could move it to more permanent position this time next year.

[Jungle Jane]

There's some webbing on that leaf on the right,the one pointing to that photo on the shelf (it might not be a photo) if you look at the leaf edge where it joins the stem. If you look carefully can you see any tiny black dots moving? If yes it's spider mite,they like the dry conditions of a windowsill,you could put the plant outside in the rain etc,in a sheltered from frost position or if keeping indoors it will be a daily task of keeping the leaves wet,maybe using oil to protect the leaves from the mite? The damage on the leaves could stop if you put it outside but inside the damage will be difficult to stop & more brown dead patches will appear.
Edit to add-it's not a photo,it's a radiator

[Kirk]

Suggest that you place it outside and if possible in a bigger pot - just it is a case of the bigger the better, or find a suitable piece of ground for it.

The change of inside to outside will cause it a problem at this time, but apples are an outdoor tree. And if indoors they will struggle.

The same happens with bonsai, people buy an expensive bonsai and because they are "small" they keep them indoors. They all die. After 1 or 2 trees it eventually sinks in that immaterial of size they are an outdoor tree.