The wasps are active from May through September. The 1.5-cm-long caterpillars look alikes eat away the mesophyll on the underside of the leaf. The leaves turn brown and fall off.
The sawfly overwinters in the soil.
A true pest can lead to growth reduction due to leaf drop. Young plantings, lime trees and trees in containers are vulnerable.
Parasitic wasps are among the natural enemies of leaf wasps: parasitic wasps lay eggs in the larvae.
Damage from the oa
Does not apply.