Question
I have a Meyer lemon tree the has blotchy yellowing leaves but only in one section of the tree. Could you tell me what it is and how to treat it?
James
SF
Answer
Your tree is showing signs of  a condition known as mesophyll collapse. It is caused by low humidity and drought conditions. It is not a disease so it cannot be treated with any spray. This is an affliction that the tree will grow out of IF a regular feeding and watering regimen begins in the spring. In addition to a citrus food fed every 6 weeks, a spring and fall supplement  of F.S.T ( iron, sulfur, zinc) will provide necessary micronutrients.
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