I've been stalking that evil armored beast for a week now!! I've sat on my porch with my SKS assault rifle night after night and nothing but holes the next day. I'm installing my night scope tomorrow. I'll get him.
Get some iron phosphate bait (sold as Sluggo or Escar-Go). The stuff works wonders on slugs, better than metaldehyde, and completely safe...you can even use it on veggies. Personally, when I've been truly motivated for revenge (and believe me, what's worse than the damage to your plants it stepping on them in bare feet...something I've done too many times...) I've gone out at night with a flashlight and bamboo skewer...I spear as many as I find, then stick the skewer in the ground in a place where I know they will get full sun come daytime...cruel? Yes......do I care?..........................? Revenge is sweet! Take care, Eric
Sluggo is a good idea.....but when I know the slugs are in the greenhouse and see where they have been, I go out there at night with a flashlight and my spray bottle of rubbing alcohol. It kills on contact, and you get the satisfaction of watching them squirm.