Holes in Iris Leaves?!

Help! Anyone know the cause? How to tackle??! Not affecting all of them YET.
I've just been (9.00pm) out to see if it was slugs - only found one. Nightmare! Thank you for any help.


I've just been (9.00pm) out to see if it was slugs - only found one. Nightmare! Thank you for any help.




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It gotten really bad and even pellets were not helping so I decided to sacrifice blooms for the year in that location. Pulled irises out from the ground and moved to pots filled with soil from a differed spot in the garden. Cut damaged leaves and let new ones re-grow by September. Left snail infested spot be for the summer and watched birds pick on something there, so I assumed lots of snails were eaten and the rest moved somewhere else. Fingers crossed this year there won’t be a bunch of snail eggs in a same spot
The problem with the garlic is that it just gets washed off regularly, so you'd be forever doing it, although it might be worth trying.