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It looks like salt burn and the black stuff is seperate and looks like mold. And the leaves are slightly chlorotic from high PH or over watering. But thats pretty normal for a potted avocado tree. It isnt really anything to worry about. It will shed those leaves this spring and flush new leaves. The tree looks fine really. It will look better when it starts doing the spring flush.
I have a hass seedling that's been doing this and I was advised to use a filter for the water. I bought one that you screw to the beginning of the water outlet. It took sometimes I'd say over 6 months to come back to normal leaves. So I'm guessing it has to do with salt and unfiltered city water full of chlorine and such.
I don't grow Avocados ......but Potassium deficiency perhaps?Search 'potassium deficiency in plants'
Quote from: spaugh on March 20, 2022, 10:47:32 PMIt looks like salt burn and the black stuff is seperate and looks like mold. And the leaves are slightly chlorotic from high PH or over watering. But thats pretty normal for a potted avocado tree. It isnt really anything to worry about. It will shed those leaves this spring and flush new leaves. The tree looks fine really. It will look better when it starts doing the spring flush. Thank you so much for your reply. Should I do anything about the moldy spot? I am a little concerned that fungus can spread quite fast.