They look like White Fly from the images, not Giant White Fly. They are all over the hollyhocks. I never see them on the roses, but that doesn't mean they won't or can't feast on them. The foliage appears to have had the sap sucked from it, like spider mite infestation, which the white fly can do. If you have large leafed perennials or annuals around, check their foliage for them, too. Insecticidal soap or horticultural oil sprays can knock them down as long as it is applied to the reverses of the leaves.
