Young Skywalker - do you really think by finding and killing every slug you see while you are down on hte allotment will make the slightest dent in the Forces of the Dark Empire? With every slug and snail you kill, more will come to take their place young padawan.
The problem with beer traps and even slug pellets - even the organic ones - is they attract slugs. Slugs love beer and can home in on it from a long distance around. Yes they drown when they get there, but more will come so long as the brew is there; munching as they go.
Slug pellets are mostly slug food with a small amount of poison. When the poison leaches out in hte rain, you are left with an allotment sprinkled with yummy slug food, which might keep them off your veggies for a while but it attracts more than you had before.
I have no problems with dispatching slugs and snails, but I see no reason to kill them when I walk to my allotment along a country lane with fields and no gardens and it is just as easy to bag them and empty them in the horse field on my way back home, or just drop the open bag into the council wastebin or dog poo bin where they will help to decompose rubbish to their heart's content.
Killing slugs is no more efficient than picking them into a plastic bag so bother why doing it? I find it morbidly fascinating that, because slugs have been the enemy of the gardener since gardening began, we use words like "it is war" and "hatred" - strong words for something so defenceless and only finding something to eat to survive, although the beast that ate through the main stem of a newly planted squash plant wasn't that popular - if it had eaten a leaf we could have both shared the plant!
I use various techniques to lessen the slug populations on my plot:
Invite their enemies - place a small pond on the site and allow the grass around it to grow a little long and introduce some wildflowers and a sheltered side made of stones and twigs and maybe a dustbin lid for frogs to hide under. This will soon bring in the slugs biggest predator and save you a lot of picking.
Give them lodgings - I place a slate half way over those plant pots you sink in the ground next to squashes and runner beans and suchlike and slugs and snails hide in the dark under the slate. You just visit the pots regularly and take away the lodgers. Often I see frogs in the pots under the slates waiting for their evening meal to turn up. Its easier to find slugs if you give them somewhere they like to be so you don't need to scan the whole plot every time.
Attract Birds - that native hedge will attract songbirds to nest if you don't cut it right back especially in early spring and the adults will be busy all summer finding tasty wireworms and other pests for their hungry nestlings.
So - there you have my ramblings. i hope you find some of it useful and at least raise a smile or even a hackle!
May the Force be with you.
/|\