Eupithecia gelidata

Möschler, 1860

Frosted Pug

Eupithecia gelidata is a small geometrid with a wingspan of 17–22 mm, distributed across northern and arctic regions. are active from June to mid-July, with one per year. Larval plant associations vary geographically: South Bohemian are obligatorily associated with Ledum palustre, while subarctic and boreal populations use Salix spp. as alternative hosts. The has been documented visiting apple flowers, contributing to pollination services.

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Pronunciation

How to pronounce Eupithecia gelidata: /juːˈpɪθiə ˈdʒɛlɪˌdeɪtə/

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Identification

Recognizable as a 'pug' by narrow forewings and characteristic resting posture with wings held flat or slightly folded. Distinguished from similar Eupithecia by geographic range (northern /arctic) and (June–July period). Genitalia dissection typically required for definitive species-level identification within the . E. g. hyperboreata occurs in Europe, northern Russia, and Greenland.

Images

Appearance

Small with wingspan 17–22 mm. Forewings narrow, typical of Eupithecia 'pug' moths. exhibit cryptic coloration consistent with . Larval coloration varies depending on plant: larvae feeding on Ledum palustre differ in color from those feeding on Salix spp.

Habitat

and subarctic including bogs, fens, and moist heathlands. South Bohemian occur in relict bog habitats where Ledum palustre dominates. Found in areas with suitable plants: Ledum palustre in Central European relict populations, various Salix in more northerly regions.

Distribution

Northern North America (Alberta, Manitoba, Saskatchewan), Greenland, northern Russia, Scandinavia, and northern central Europe. Includes relict bog in South Bohemia.

Seasonality

. on wing from June to mid-July. Larvae present from mid-July to August. Overwinters as pupa.

Diet

Larvae feed on Ledum palustre (marsh tea, obligatory in South Bohemian ) and Salix spp. (willows, alternative host in subarctic and regions). Laboratory studies confirm larvae can complete development on either host but strongly prefer Ledum palustre when available.

Host Associations

Ledum palustre - larval plantObligatory for South Bohemian relict ; preferred host in laboratory conditions
Salix spp. - larval plantAlternative in subarctic and regions where willows are present

Life Cycle

Complete . One per year. laid on plants. Larval development from mid-July through August. occurs in late summer; overwinters as pupa. emerge following spring/summer.

Behavior

are and have been observed visiting apple flowers, indicating nectar-feeding and potential role in nocturnal pollination. Larvae exhibit plant fidelity in natural , with clear feeding preference for Ledum palustre demonstrated in laboratory experiments.

Ecological Role

Herbivore as larva; contributes to nutrient cycling in bog and . Documented as visitor to apple flowers, suggesting role in pollination services for crops and wild plants. Serves as for including braconids in Agathidinae.

Human Relevance

Potential of agricultural crops including apple. Larvae not considered economically significant pests. Subject of ecological research regarding plant specialization and geographic variation in food plant use.

Similar Taxa

Other Eupithecia speciesMany 'pug' share narrow wing and small size; genitalia examination typically required for definitive identification
Eupithecia gelidata hyperboreataRecognized occurring in Europe, northern Russia, and Greenland; distinguished by geographic range

More Details

Geographic variation in host use

show striking geographic variation in plant . South Bohemian relict populations are isolated in bogs and depend entirely on Ledum palustre, while northern populations retain flexibility to use Salix. This represents one of the better-documented cases of host race formation or incipient ecological speciation in the .

Taxonomic homogeneity

Despite differences in plant use and larval coloration between , the appears taxonomically homogeneous. No have been erected based on host plant differences.