Pryeria

Moore, 1877

Species Guides

Pryeria sinica(euonymus leaf notcher)

Pryeria is a of zygaenid native to southeastern Asia, with three described . The genus gained attention when Pryeria sinica was discovered in Virginia and Maryland in 2002, representing a new pest of ornamental Euonymus shrubs in North America. The larvae are gregarious feeders that create distinctive marginal notches on leaves.

Pryeria sinica 2794345 by Kim, Hyun-tae. Used under a CC BY 4.0 license.

Pryeria sinica (10364372965) by LC Shih. Used under a CC BY-SA 2.0 license.

Pryeria sinica in the city by E. Jones. Used under a CC0 license.

Pronunciation

How to pronounce Pryeria: //praɪˈɛriə//

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

Identification

can be distinguished from other zygaenids by their -mimicking appearance, day-flying , and clear wings with yellow basal patches. Larvae are recognized by their white bodies with black longitudinal stripes, gregarious feeding habits, and distinctive marginal leaf notching on plants. The presence of specialized cuticular cavities for cyanoglucoside storage is a distinctive anatomical feature of Pryeria sinica larvae.

Images

Habitat

Associated with Euonymus and other Celastraceae shrubs in both native and introduced ranges; occupies undisturbed as well as ornamental plantings in urban and suburban landscapes.

Distribution

Native to southeastern Asia including eastern Russia, China, Korea, Japan, and Taiwan. Introduced and established in the eastern United States, specifically in Maryland (Anne Arundel, Prince George's, Baltimore, Carroll, and Baltimore City counties) and Virginia (Fairfax and Prince William counties), with potential for further northward expansion.

Seasonality

with hatching in mid-March to early April; larval development occurs through spring; emerge in late October and November, with day-flying activity in autumn.

Diet

Larvae feed on leaves of Euonymus (E. japonicus, E. kiautschovicus 'Manhattan', E. sieboldianus, E. alatus) and other Celastraceae including Celastrus punctatus and C. orbiculatus (Oriental bittersweet).

Host Associations

Euonymus japonicus - primary both native and introduced ranges
Euonymus kiautschovicus 'Manhattan' - North America
Euonymus sieboldianus - native Asian range
Euonymus alatus - native Asian range
Celastrus punctatus - Celastraceae
Celastrus orbiculatus - Oriental bittersweet
Agrothereutes minousubae - ichneumonid , major mortality factor in native range

Life Cycle

occurs as deposited in clusters of 130-150 or more on pencil-sized twigs near branch terminals from October through December. Eggs hatch in mid-March to early April. First instar larvae feed in tight silken webs spun around unfolded leaves at terminals, then move to expanded leaves as they grow. Larvae are gregarious and often found in large groups. Prepupal and pupal stages occur from mid-April to late May, with in silken cocoons amid fallen leaves or protected locations. emerge in late October and November, mate, and deposit overwintering eggs.

Behavior

are fliers, unusual among , and exhibit of to avoid by birds. Larvae are gregarious feeders that initially skeletonize leaves in silken webs, then notch leaf margins as they grow. Late instar larvae wander from plants to seek protected sites.

Ecological Role

In its native range, Pryeria sinica forms a one -one system with Agrothereutes minousubae, which acts as a significant conditioning factor through parasitization of prepupal and pupal stages. The 's early spring larval development may reduce pressure due to low natural enemy activity at that time.

Human Relevance

Pryeria sinica is an pest of ornamental Euonymus shrubs in the eastern United States, capable of completely defoliating plants when abundant. Management options include pruning and destroying masses from December until hatch, manual removal of larvae, or application of Bacillus thuringiensis kurstaki or spinosad-based . The slow spread of this pest (remaining largely in Maryland and Virginia for over 20 years) contrasts with more rapidly dispersing invasive insects.

Similar Taxa

ZygaenaBoth are zygaenid with cyanogenic defensive secretions stored in cuticular cavities; Pryeria differs in having non-contiguous aposematic pattern relative to these cavities and two types of opening structures on type I cavities
Syntomeida epilais (Oleander moth)Both are day-flying, -mimicking zygaenids with warning coloration; Pryeria is distinguished by clear wings with yellow basal patches rather than metallic blue-black coloration

More Details

Population Variation

Korean and Japanese of Pryeria sinica show distinct differences in thermal and photoperiodic response. The Korean population exhibits optimal larval development at 15°C, while the Japanese population shows higher early-instar mortality at 15°C but better at 15-20°C in later stages. Japanese populations also display stronger sensitivity with more pronounced reductions in pupal duration under short-day conditions. Korean populations differ morphologically from Taiwanese populations in distribution (first through eighth abdominal segments versus lacking first segment spiracles in Taiwan) and wing venation patterns, particularly in cubital and anal bifurcation.

Defensive Chemistry

Last instar larvae possess two types of cuticular chambers homologous to those in Zygaena trifolii, used for storage of cyanogenic defensive secretions. Type I cavities bear two different opening structure types, suggesting independent development of these mechanisms within the Zygaeninae.