There are several discussions about this, just type in slug in the search option , the little magnifying glass next to your avatar in the top.
I witnessed a slug in this super wet year climbing on a baby lettuce , smelling it ( i swear to God)and slide off without eating it, it was a mix of varieties that i got from fellow members, must be a hundred varieties. I save seed and just seed again when they come, and hope for a dryer period where they disappear or this weird disease that pops up out of nowhere when they’re at their peak.
Chaos gardening works as well, cause slugs need to change their stomach every time to eat something different.
The following is a translation from a dutch permaculturist Marc Siepman, much info on them. Instead of bad, bad, bad snails. Snip them in two, throw them to your evil neighbore, drown them in beer, poison them to death (and kill their predators while you’re at it), it explains that we cannot win, no one ever has and why that’s perfectly fine and why you should embrace the slug.
Author: Marc Siepman, marcsiepman.com
Taxonomically, the snail belongs to the Gastropoda, which means “gastropods. The average gardener will find this an apt description; it is little more than a stomach on a slimy foot. Because snails reveal faults in the system, they are not too popular with gardeners. Yet they are ecologically important. An ode to the snail!
Left-wound houses are very rare. Jeremy (above) has become quite famous. Photo: Angus Davison, University of Nottingham.
Relationships
The essence of permaculture is to restore and maintain relationships, in as much diversity as possible. Therefore, you cannot speak of harmful or beneficial organisms; they all have a function. For example, weakness parasites like the tarantula remove weakened trees from the system to make room for healthier ones, which is hugely important. Snails actually do the same thing: they make space by removing (parts of) weak plants.
Snails have many other relationships with other organisms. For example, slugs move the spores of mycorrhizal fungi, to name a few.
Food
Not every snail eats the same thing. Slugs, such as the common road slug, are known to cause considerable damage to living plants.
Translated with DeepL.com (free version)
The article is here, if you are ready to love the slug, translate it!