My avocado tree is sick

[Ilovepalm]

Hi. I have 3 annual avocado cuttings. They are all healthy, only one of them has brown spots. When I gave her to the window sill, her leaves had withered in a few hours. I have watered, but I do not know if it can be saved. What could have happened to her? He is in room 20 Celsius, I water on average every few days. I watered a biohumus throughout the winter, now I slowly introduced the fertilizer.

Two weeks ago he looked like this:

Edited March 15, 2019 by Ilovepalm

[Dypsisdean]

Avocados are notorious for "Brown Tipping." I think some of those brown spots are this tip or edge browning. The other in the center - I'm not sure - looks like something else.

But the "Brown Tipping" is caused from "hard" water, like that from many municipal and well water systems. You won't find an orchard in SoCal (notoriously bad water) where older leaves don't have a lot of Brown Tipping. I just thought it was normal until I moved to Hawaii. The trees here, living on pure rain water do not have it.

So - use rain or filtered water low in TDS (total dissolved solids) if in pots. If in the ground - not much you can do except pray for rainy years.

[Ilovepalm]

@Dypsisdean All the seedlings I watering the same standing water, only one has stains.

[Dypsisdean]

If you begin to see tip burn on the older leaves it's probably the water.