Euproctis chrysorrhoea

(Linnaeus, 1758)

Brown-tail Moth

Euproctis chrysorrhoea, the -tail , is a forest pest with a highly larval stage. exhibit phenological plasticity, with larval timing and winter feeding varying based on foliage persistence. The demonstrates sequential host plant utilization during mass and shows evidence of host-associated genetic divergence. possess urticating that pose human health risks.

Euproctis chrysorrhoea by (c) Donald Hobern, some rights reserved (CC BY). Used under a CC-BY license.

Euproctis chrysorrhoea by (c) Drepanostoma, some rights reserved (CC BY), uploaded by Drepanostoma. Used under a CC-BY license.

Euproctis chrysorrhoea by (c) Tony Morris, some rights reserved (CC BY). Used under a CC-BY license.

Pronunciation

How to pronounce Euproctis chrysorrhoea: /juːˈprɒktɪs krɪsɔːˈriːə/

These audio files are automatically generated. While they are not always 100% accurate, they are a good starting point.

Identification

identified by and conspicuous hair tuft at tip. distinguished from similar lymantriine by paired tufts of and dark coloration with white stripes. Distinguished from by smaller size, different hair tuft arrangement, and preference for younger foliage. Microscopic examination of may be required for definitive identification in some regions.

Images

Appearance

have with a brownish tipped with conspicuous golden- hairs, giving the its . are dark with white longitudinal stripes and possess numerous urticating (stinging) hairs arranged in tufts along the body. Full-grown larvae reach approximately 30 mm in length.

Habitat

Primarily associated with forested and semi-forested environments. Found in oak-dominated woodlands, mixed deciduous forests, and areas with fruit tree . on evergreen (Arbutus unedo) occupy Mediterranean scrub and maquis vegetation. Occurs from sea level to montane elevations, with local to host .

Distribution

to Palearctic region: Europe (widespread from Scandinavia to Mediterranean), North Africa (Algeria, Morocco, Mauritania, Tunisia), and Asia (Turkey, Iran, Syria, China, Japan, Korea, Sakhalin). to North America (northeastern USA, eastern Canada), where established occur in Maine and adjacent regions. Present in Belgium, Netherlands, Germany, France, Spain, Portugal, Italy, and throughout Central and Eastern Europe.

Seasonality

with one per year. laid in July; egg stage lasts approximately one month. Larval stage extends nine months, with as young . occurs in spring for approximately one month. typically in July, though delayed emergence has been observed in dry conditions. on evergreen Arbutus unedo exhibit shifted with winter feeding from October to March.

Diet

Highly folivore. feed on diverse including oak (Quercus), elm (Ulmus), poplar (Populus), hawthorn (Crataegus), and fruit trees (Prunus, Malus). During mass , exhibits sequential utilization, switching between in a defined as preferred hosts become depleted or pressure increases. On evergreen tree (Arbutus unedo), larvae engage in winter feeding with arrested development during a true period of approximately two months.

Host Associations

Quercus - larval primary , major damage in oak forests
Ulmus - larval deciduous with typical
Populus - larval recorded
Crataegus - larval recorded
Prunus - larval fruit tree
Arbutus unedo - larval evergreen with shifted and winter feeding

Life Cycle

with four stages: , , , . Eggs laid in clusters on foliage. Larvae through multiple over nine months, typically entering as young larvae in autumn. in silken on or in ground litter. Adults non-feeding, short-lived. time one year. exhibit cyclical dynamics with 4-6 year cycles reported.

Behavior

are gregarious, particularly in early , and construct silken webs for shelter. Sequential switching occurs during , with larvae moving between plant in a predictable . Winter feeding observed on evergreen hosts represents a true with arrested development, not continuous feeding. Larval by ballooning on threads has been reported. are and attracted to light.

Ecological Role

Defoliator of trees and shrubs; can function as pest causing significant forest damage. Serves as for diverse including and . (, Endoreticulatus) regulate in some regions. Provides food source for insectivorous birds including storks, starlings, and finches. contribute to anti- defense and may affect vertebrate foraging.

Human Relevance

Significant forest and orchard pest causing to timber, fruit, and ornamental trees. Urticating larval hairs cause dermatitis, respiratory irritation, and allergic reactions in humans and livestock, necessitating caution during management. Subject to efforts using bird and release. Chemical control complicated by development and non-target effects on and . Subject to and management efforts in invaded North range.

Similar Taxa

Lymantria disparSimilar lymantriine with ; distinguished by larger size, different larval color pattern ( and red rather than dark with stripes), and more pronounced in
Euproctis similisCongeneric with similar appearance; requires examination or molecular analysis for definitive separation
Sphrageidus similisFormerly confused with E. chrysorrhoea; distinguished by and larval hair arrangement

More Details

Host race formation

Evidence suggests -associated genetic divergence, with on different host plants exhibiting phenological differences and potential reproductive isolation. Populations on evergreen Arbutus unedo show shifted compared to those on deciduous hosts, yet retain common communication systems.

Population dynamics

typically develop from rather than external . Severity correlates with including drought and temperature. range expands with outbreak intensity, following a predictable sequence of utilization.

Phenotypic plasticity

Larval development on evergreen versus deciduous demonstrates local to host . Presence of foliage is a driver of phenological shifts, with winter feeding on evergreen hosts accompanied by a true period rather than continuous development.