Last modified: June 18, 2022, 4:13 p.m.
A not so common species throughout Belgium.
Wingspan: 35–45 mm.
Adults of Acronicta cuspis, Acronicta tridens and Acronicta psi cannot be safely distinguished from each other, except by reference of the genitalia. Allthough larvae of these species are quiet different and are easy to identify as species.
Hibernates, sometimes for several years as a pupa under bark or in bark crevices of the foodplant.
The adults come to light and sugar.
The adults fly in two generations a year: from mid April till begin of September.