Little green caterpillars on my young rose

Hi,
I noticed several little green caterpillars (possible Sawfly larve) on the top leaves of one of my young black Baccara roses and picked them off. The little beasties ate a few leaves, I treated the plant with some bug clear insecticide and noticed this morning some more leaves were gone.Only found one caterpillar this morning though there was about ten yesterday.
I have read Provado will kill them. But I am concerned that I have already used a treatment and don't want to over treat the plant.I tried to check under the leaves but I cannot bend down very well to check the lower leaves.
Any advice would be appreciated.


They are all dead I cannot see any more leaves have been eaten.