An infestation of the larvae can defoliate an oak tree.

The adult female lays its eggs next to leaf buds, which the larvae consume when they emerge.

As the larvae grow bigger they eat larger leaves, and then roll themselves up in a full-sized leaf to pupate.

[1] The Ichneumon wasp Dirophanes invisor is a parasitoid which specializes on T. viridana.

In the Butterfly Conservation’s Microlepidoptera Report 2011 this species was classified as common.