Large Rose Sawfly (Arge pagana)
If you check your roses now you might find these gregariously chomping away on the leaves. It is possibly one of 2 species of sawfly Arge pagana or Arge ochropus, and it is hard to tell which in the early instar stage. But if you can find the original egg scar on the stem you will know what species it is for sure. If it has a double row of cells it is Arge pagana, and a single row determines Arge ochropus. From my own past experience, unless you get a whole army of these chomping larvae they won’t seriously damage your rose. Sometimes the birds will grab them for protein.