Plagodis pulveraria
(Linnaeus, 1758)
Barred Umber
Plagodis pulveraria, commonly known as the barred umber, is a geometrid first described by in 1758. It is widely distributed across the from Ireland to Japan, with additional in Canada. The exhibits considerable color variation, ranging from reddish- to violaceous grey, with diagnostic straight antemedian and incurved postmedian on the . are active in two from mid-spring through summer.
Pronunciation
How to pronounce Plagodis pulveraria: /ˈplæɡoʊdɪs ˌpʊlvəˈrɛəriə/
These audio files are automatically generated. While they are not always 100% accurate, they are a good starting point.
Identification
Distinguished from similar Plagodis and other geometrid by combination of: (1) relatively straight antemedian on , (2) strongly incurved postmedian line creating curved boundary to area, (3) consistent reddish- ground coloration regardless of variant, and (4) small, rounded shape. The incurved postmedian line is particularly diagnostic—most similar species show straighter or differently curved postmedian lines. Color variants can be confused with other reddish geometrids, but line pattern remains consistent. Smaller size and rounder wings separate it from larger, more angular Plagodis species.
Images
Appearance
Small to -sized with wingspan 28–33 mm and length 17–19 mm. Ground color variable but consistently showing reddish tones, ranging from to violaceous grey or purple-tinged in some forms. Forewings marked by relatively straight antemedian and posteriorly strongly incurved postmedian line; area often darkened. generally plainer with lines less pronounced. relatively small and rounded. Several named color variants described, including violaceous grey (ab. passetii), deeper red with orange and purple tones (ab. marginepurpuraria), uniform brown without lines (ab. unicolor), and brighter -brown (gadmensis).
Distribution
: Ireland across Europe to Japan; specifically recorded from Belgium, Netherlands, Switzerland (Gadmenthal), Russian Far East (Amurland), and Japan/Korea. : Canada. Exact preferences within these regions not documented in available sources.
Seasonality
in two from mid-March to August in Belgium and Netherlands; timing may vary across range. No specific data on in other parts of distribution.
Diet
Larval stage feeds on various deciduous trees including oak (Quercus), birch (Betula), and sallow (Salix). feeding habits not documented.
Host Associations
- Quercus - larval deciduous oak
- Betula - larval birch
- Salix - larval sallow/willow
Life Cycle
(two per year) in at least part of range. with , , , and stages. Larval stage associated with deciduous trees. Specific details on site, stage, and developmental duration not documented.
Behavior
active during spring and summer months. No specific behavioral observations on mating, , or adult movement patterns documented in available sources.
Ecological Role
Larval on deciduous trees; contributes to through leaf consumption. Specific ecological impacts or interactions not quantified.
Human Relevance
No documented economic importance. Subject of entomological interest due to color variation and wide distribution. 'barred umber' used in European recording schemes.
Similar Taxa
- Plagodis dolabrariaSimilar size and coloration, but has straighter postmedian and more angular shape; area pattern differs
- Other reddish EnnominaeColor variants of P. pulveraria may resemble various geometrids, but diagnostic pattern (straight antemedian, incurved postmedian) is distinctive
- Plagodis japonicaFormerly treated as or variant of P. pulveraria; now possibly distinct based on brighter red- color, broader area, and straighter continuing to
More Details
Taxonomic complexity
The shows extensive color variation with multiple named forms (ab. passetii, ab. marginepurpuraria, ab. unicolor, gadmensis, violacearia, japonica). The Japanese/Korean (japonica) has been treated as both a color variant and a potentially distinct species due to consistent differences in coloration and pattern.
Flight season caveat
Documented pattern with mid-March to August period refers specifically to Belgium and Netherlands; likely varies with latitude and climate across the wide geographic range.