cut and curled leaf

cut and curled leaf

Observation - cut and curled leaf - UK and Ireland. Description: This is the end section of a leaf which has been cut (bitten) and rolled up except for the main centre vein of the leaf where it remains attached. Can anyone suggest what has caused this?

This is the end section of a leaf which has been cut (bitten) and rolled up except for the main centre vein of the leaf where it remains attached.

Can anyone suggest what has caused this?