Last modified: March 13, 2023, 2:31 a.m.
An extremely rare, local and decling species in Belgium with scattered observations.
Wingspan: 35–41 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.
From June till October.
The species hibernates as a pupa.
The adults come to light and sugar.
The adults fly in two generations a year; from mid-May to mid-August.