Attempt making use of a granular fertilizer to the irrigated areas underneath the tree excessive in calcium, magnesium, sulfur and potassium early subsequent spring. If that doesn’t work you will have to ship a soil pattern for testing to a licensed agricultural soil testing lab (similar to A and L in Modesto, California) or do it your self however look particularly on the nutrient ranges. It’s in all probability not a pH (alkalinity) drawback.
If it seems to be a calcium deficiency, let me know and I can inform you we now have corrected this drawback. It could require spraying the leaves.
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