I noticed some of our Columbine was being defoliated at a rapid pace. A closer look revealed small (1/2") green worms with a dark green stripe down their backs.One seemed to curl upwhen I held it in my palm. They look like a photo of a leaf roller I've seen recently.

Is BT effective on these if they are, in fact, leaf rollers? If not, what is?

I'd like to stop them now before they get to my rose bushlike they did last year.