Leatherjackets and lettuces

[SpadelessAde]

I planted 9 lettuces grown in modules, all a reasonable size, a couple of weeks ago. I surrounded each plant with Slug Gone (dried sheeps wool which has always worked for me against slugs every time) and every single lettuce has disappeared. I’m thinking that it must be leatherjackets in my case too. I was going to plant out some rocket that I’ve grown in modules, but after reading these posts, I’m wondering whether I should leave them in their modules for a while.