Avocado interveinal chlorosis
I have avocado tree. It has interveinal chlorosis. It looks like it has iron deficiency. Lower leafs are more dark green than upper leafs. Most leafs have necrosis on tips. New growth is dying right at start.
I keep it on south facing window and water every time soil gets dry.
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    Paris Lalicata Hi Zakhar! It certainly appears your plant has a nutrient deficiency - I would recommend replenishing the plant with fresh soil if you haven't done so in awhile, or giving the plant fertilizer on a weekly basis when you water the plant!
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    Zakhar More photo