Answer: Curled leaves usually indicate a pest problem. Aphid feeding can cause leaves to curl so that's probably the problem. Since both apids and white flies can be discouraged or controlled with insecticidal soap applications, that's what I would recommend using on your tree. Be sure to spray the undersides of the leaves to get the aphids. If you spray in the early morning or just at dusk, after the whiteflies have settled down for the night, the sprays will be more effective. Be sure to read the label and apply according to directions.
Best wishes with your citrus tree!
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