Me too. I have two patches of dahlias, both with several plants of Bishops Children. One patch is full of flowers, the other, everytime a flower opens the petals get eaten off. I suspect slugs. I'm going to scatter some slug pellets around the plants and see if that helps. I use a safe, organic brand I got at Lowe's. It's mineral-based, no chemicals. Worked well in the veg last year.
