I apologize for this delayed reply to your gardening question. The spring rush has brought a deluge of questions and we are working hard to catch up!
Leaf curling on citrus can be due to several things including small insects such as aphids feeding inside the leaf. I suggest you take a sample of the leaves to your County Extension Office for identification, and if necessary, control recommendations.
Thanks for the question. Best wishes for a wonderful gardening season. Please stop in again soon!
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