slugs and runner beans

I'm at a loss on how the slugs have gotten through the barriers I have put in place I might have to accept defeat........

18 runner bean plants put in each about a foot high.

Yesterday I noticed a couple of leaves have been munched on despite covering the ground around them in woodash very heavily, beer traps with fresh beer and after the leaves being munched I even surrounded each with and hand full of slug pellets each last night.

This morning there is not a sign of the plants or the slug pellets!? When I put then down last night you could not see any soil around each plant I spread them that densely.

How does this happen was it just a plague of slugs?!

I might go out and buy some plants if someone can give me some advice how I could possibly stop them?

Maybe a different pest altogether, if all of the plants have gone.

It is said that applying blue pellets too thickly can be counter-productive because they contain a powerful attractant which makes it more likely that some of the resulting invading hordes are bound to get through. I find it hard to believe that's likely to happen if there's an unbroken ring of pellets around each individual plant, but it might be something to consider in the future.
More likely to happen with the 'organic' pellets than the more traditional metaldehyde version, as they are not a direct poison.

Having said all that, as Mum has posted, for 18 X 1 foot bean plants to completely disappear overnight does suggest something other than slugs or snails being responsible...

maybe your next allotment holder has just planter 18 beans