I picked a few off and moved them over to my neighbours huge kaffir lime tree - I am sure that can support a few more catterpillars. I kept five - I think they are the same as I watched one emerge last year. orchard-swallowtail-butterfly- . those I had on a branch I had picked from a neighbours tree, but this time I clearly have a preffered host plant for them.
Citrus fruit can be plagued by a lot of problems in the tropics, but limes are more resistant than lemons or oranges. I had bought some oil spray thinking that the curling leaves were a sign of leaf miner, but havnt used it yet. Now I am not so sure I will use it as it might kill the caterpillars AKA baby butterflies! I just hand plucked the few leaves that seemed to have prolems.
The catterpillars have been munching on the leaves and getting fatter and fatter.