Moth or Sawfly larva ?

Moth or Sawfly larva ?

Observation - Moth or Sawfly larva ? - UK and Ireland. Description: These eggs appeared on a cultivated rose in my garden approx 18/08/11 ,they emerged on 03/09/11 and some glided away on silken threads, only 2 remain any idea what they are ?

These eggs appeared on a cultivated rose in my garden approx 18/08/11 ,they emerged on 03/09/11 and some glided away on silken threads, only 2 remain any idea what they are ?