The leaves appear to have rusty looking blotches. What can I do about it, please?
Kaffir Lime Leaves
Certified GKH Gardening Expert
If there are no other symptoms then the most common issue here is iron deficiency. Feed with iron sulfate and the new growth will be unaffected. The old growth will not lose the spots, but they won't spread. Here is a link that will help: https://www.gardeningknowhow.com/garden-how-to/soil-fertilizers/iron-for-plants.htm