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Species Page - Ennomos subsignaria
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scientific name    Ennomos subsignaria    

common name     Elm Spanworm

habitat
In Alberta, restricted to southern prairie riparian woodlands.

seasonality
The only Alberta record is for late May; July and August elsewhere (McGuffin 1987).

identification
A large pale white-tan geometrid with pointed projections along the wing margins. The wings lack conspicuous markings. Tetracis cachexiata is similar, but has a straight transverse line crossing the forewing.

life history
The larva occurs in several colour forms, all of which resemble twigs like most ennomine geometrids. Colour forms include yellow, green, brown, and nearly black (Wagner et al. 2001). McGuffin (1987) states that some colour forms may be induced by population density, with crowded larvae being dark and isolated larvae light. Eggs are laid on the undersides of twigs, where they overwinter. Like E. magnaria, larvae often spin a cocoon amongst foliage to pupate, unlike most other geometrids which pupate underground. In the East this species is sometimes abundant enough to defoliate trees (Wagner et al. 2001).

conservation
Rare in AB (1 record), but widespread and occasionally reaching pest status elsewhere.

diet info
Larvae feed on a variety of hardwood trees; the only recorded hosts which occur in Alberta include white birch, trembling aspen (Populus tremuloides) and Manitoba maple (Acer negundo) (Prentice 1963).

range
Southeastern Alberta east to Nova Scotia, south to FL and TX (McGuffin1987).

quick link
http://entomology.museums.ualberta.ca/searching_species_details.php?s=4194



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References (3)
Specimen Info
There are 11 specimens of this species in the online database
Map Distribution
Adult Seasonal Distributioncreate a collection histogram with specimens
Specimen List (11)
Related Links
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