Now most of the green leaves have fallen. I have a magnolia with curled leaves with an ashy powder. It sounds as if your lime is getting too much water. Make sure the container drains well. We have had a cool spring, and the soil in containers has not dried as quickly as it would if temperatures were in the 80s and 90s.
Citrus likes water, but only as needed.
Allow the top inch of the soil in the container to dry before watering. Frequent fertilization can build up excessive salt. When this happens, you will see a white crust on the soil and pot. Leach to remove salt buildup. Water for several minutes, allowing the water to drain completely.