Rose leaf eating bug? | Plant diseases | Urban Gardening, Terrace gardening and Hydroponics

Hello all..this is my first post here... so most of my rose leaves are being eaten or more like bitten into from the edges going towards the centre..there are now semicircular patches all around the edge of a leaf..the cuts are regular and sharp ...on the underside of a few leaves, I found small whitish bugs ( sort of elongated bodies) but I am not sure if they are the ones eating the leaves... I have no idea how to go about this problem..can someone please help me here??