Raspberry Sawfly (Monophanoides geniculatus) larvae can be very damaging to raspberry leaves. On rare occasions of heavy infection, only the larger veins remain uneaten.
More information:
- Notes on Raspberry Insects – Raspberry Sawfly – (OMAFRA)
- Raspberry Sawfly – (Washington State University)
- Raspberry Sawfly (Monophadnoides geniculatus) – (Manitoba Agriculture, Food and Rural Initiatives)
Use these resources if you need additional help with diagnosis and to find solutions to your problem.