Sorry, I noticed this post today, so I am a bit late...
Slugs are a massive pain in my garden.
I tried a lot of different methods to take care of them (poison, beer trap, eggs shell, ashes, copper wire, thorny branches around, ...)
The conclusion : nothing fully works.
The best solution I found is a combination of hunt and poison and trap (and even with all this we still have too many slugs).
Poison : I put some iron phosphate to reduce their number, but it is clearly not enough.
Hunt : in the night, or when it's raining, go out in your garden and harvest them by hand.
Trap : put some wood planks around your plants with some leaves of salad under. In the morning you return your wood planks and get rid of the slugs.
The other methods did not show any significant improvement in our garden (beer trap, eggs shell, ashes, copper wire, thorny branches around...)
This year, we did not use any poison (for at least 6 months) because we wanted to use hens to eat the slugs.
So we only used the hunt and trap methods, but we are having really toooo much slugs (we don't have a lot of snails by the way).
We finally bought 3 hens one week ago, but for now they are clearly not interested in slugs... !!!
They LOVE earthworms, any kind of worms but they don't touch slugs...
Since we are having again real troubles with toooooooo many slugs, we put some iron phosphate yesterday in all the vegetable garden (and the tobacco patch).
I really hope it will help reduce the threat (in combination with hunt and trap).
Here is a picture I took a few days ago, on one of our potatoes patch, it was in the mid afternoon, after a good rain, it was warm :
View attachment 36410
"Where is Charly ?"
Can you find the slugs ?
Good luck