just to say that this is working very well for us, at least as effective as beer and much cheaper.
dissolve some sugar in warm water, add yeast, put in shallow dishes on the ground. only needs replacing when it either all evaporates or overflows/is too diluted from rain.
also if anyone doesn’t like to crush/chop slugs, our method is to drop them in a bucket of water that has a little washing up liquid in it. eco washing up liquid works fine (disturbingly?). they most certainly don’t crawl out of there. when the bucket gets too full we toss it on the compost after leaving it overnight to make sure the most recent additions don’t recover.
we are getting ducks soon though, to eat them all
p.s. i keep reading that the largest black/orange variety of slugs only eat seedlings in the spring and then ‘do their job’ of eating decaying vegetation, therefore there’s no need to persecute them as much as the smaller slugs. well around here the giant slugs are all over everything!