Answer: What you describe sounds like salt burn. This excess salt accumulates in the leaf edges, where it kills the tissue and the leaf dries out and turns brown. Browning usually occurs on the older, lower leaves first. Our water and soil contains significant salts. At least once a month, water deeply enough to "leach" or push salts below the root zone. Frequent, light "sprinklings" allow salts to accumulate in the top layers of soil, where the roots are, which is bad news. Similar symptoms occur when too much fertilizer has been applied. Finally, avocado trees don't thrive in desert growing conditions, especially outdoors, so the stressed trees are more susceptible to problems.
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