The fastest (non-choppy and non-chemical) way I found to dispatch them is water with a squirt of washing up liquid in it. Plain water is no good, they seem to be unaffected and slowly climb out again. Beer traps sort-of-work but you get an unspeakable slug/beer soup, and it also attracts more because they eat their dead.
Washing up liquid water takes them out in a few seconds. It's still gross because they sort of bloat and leak, but at least it's over quickly and you can dispose of the hideous mess.
I had a major war on slugs a few years ago.
The fastest (non-choppy and non-chemical) way I found to dispatch them is water with a squirt of washing up liquid in it. Plain water is no good, they seem to be unaffected and slowly climb out again. Beer traps sort-of-work but you get an unspeakable slug/beer soup, and it also attracts more because they eat their dead.
Washing up liquid water takes them out in a few seconds. It's still gross because they sort of bloat and leak, but at least it's over quickly and you can dispose of the hideous mess.