Leaf Miners

Hi everyone,
First off thanks to all who give helpful advice here.
I have almost completed my first outdoor afghan and low-ryder grow in the Caribbean and it seems my biggest problem even in my youngest plants has been Leaf Miners. I have searched on these forums with no luck,does anyone know how to deal with them????
Are they a big deal or just damaging to the particular leaf, some of my 2nd grow and 3rd seedlings are showing signs too :(
I have been using neem oil to foliar spray but I know it does not kill the larvae as they make little roads on my leafs!!!!
Any advice would be appreciated.....