Just to re-iterate, these cabbages have been under enviromesh since small plants. I didn't lay any slug pellets and I never had this amount of damage from slugs yet.
Yet.
So is this slugs ?
I've been removing the outer leaves in the hope of disturbing whatever it is that's eating the leaves, some cabbages are hearting-up. Some are so damaged they are struggling.
Last year I grew cabbage that wasn't covered, I lost 50% to the wind. No problem with cabbage-whites or slugs though I may have put slug pellets down. A failing memory isn't very helpful.
