Scarce Dagger
Common NameScarce Dagger
Scientific NameAcronicta alni
FamilyNoctuidae
SubfamilyAcronictinae
Wingspan (mm)35
Wing Patterncryptic
Primary Colorsgrey, black, white
HabitatWoodlands, parks, gardens, hedgerows
Geographic RangeEurope, temperate Asia to Japan
Host Plantsalder, birch, oak, willow, hazel, lime
Flight PeriodMay to July
Flight Stylefluttering
Conservation Statusleast-concern
Lifecycle NotesThe larva is highly distinctive, initially resembling a bird dropping, then developing into a black caterpillar with yellow bands and prominent club-shaped black hairs. It pupates in a cocoon under bark or in the soil.
Identification TipsAdults are identified by their mottled grey and black forewings, often featuring a subtle black dagger-like mark near the tornus. The larva is unmistakable with its unique black and yellow banding and clubbed hairs.
Description
A medium-sized moth with forewings cryptically patterned in mottled shades of grey, black, and white, resembling tree bark. Its stout, hairy body matches the wing coloration, providing excellent camouflage.
