Ok, I know that most people think pillbugs are not a pest to healthy plants.

However, there was a very healthy gazania planted in our garden that has been reduced to almost nothing. I've checked it out after dark for the past three nights and all I've found is several pillbugs all over the plant. I recently spread some sifted, almost finished compost on the garden (basically shredded leaf mulch), which of course had a large population of pillbugs and sowbugs. During the day I move some of the mulch away around the base of the plant and I find numerous pillbugs curled up.

Could these really be the problem?

Or is something else coming out later on in the night and the pillbugs are just cleaning up the damage?

The leaves of the gazania look like they were cut with very dull scissors. They have all been eaten from the tips down except for one mature flower stalk. Nothing else in the garden has been affected to this degree and there are even tasty pansies about two feet away (so definitely not a rabbit).