I bought Abies koreana molli tree (25 cm high) 3 month ago. Im keeping it in my flat at the balcony door (so it shoudl have enough light). Temperature in my flat is constantly at 18-20 degress of Celsius.
1 month ago, I discovered that lower branches were attacked by Tetranychus mite - I sprayed it with spcialized pesticied that was intended to kill these. It killed mites succesfully, but needles from lower branches started to fall of (because they were damaged too much by the mites).
I though that the tree will regenerate and everything will be fine, but problem is, that currently, almost all the needles are slowly falling of (they either slowly turn brown or fall of even while green after I gently touch them).
I examined the tree again and found out, that some of the needles on few branches have green-brownish areas (first photo) on them and also little brown "protrusions" at the middle axis of the needle (Second photo and third).
Is this some kind of disease? Can it be cured? I searched other forums and tried to compared images with some other diseases, but found nothing.