Usually when I have heard about deer damage, I hear about entire scapes being destroyed but as we don't have deer in the area that I live in, I have not seen the damage personally.
I actually have had slugs do similar damage to blooms (the real ragged edges) on a couple of occasions but it has always been accompanied with leaf damage and slime trails which I am not seeing here - also, the buds were usually attacked prior to opening and the slugs were out in large numbers.
It would be interesting to see what the folks over on the Daylily Forum think.
