Appendix A: (Geometridae / Ennominae)
70.2361 [B&F: 1916a] Elm Spanworm (Ennomos subsignaria) (Hübner, 1823)


One was found at Covent Garden flower market, London on 26 April 1984 as a pupa amongst Asparagus plumosa (Asaparagus Fern) imported from Florida, with the adult emerging on 2 May 1984. Resident of North America, found from Texas to Alberta and east to the Atlantic coast, where it can be a commercial pest. A large pale white-tan geometrid with pointed projections along the wing margins; the wings lack conspicuous markings. Univoltine, on the wing from late May to August. Wingspan 36-44 mm. The origin of the British specimen (with imported Asparagus) is somewhat at odds with the larva feeding on a variety of hardwood trees in its native range.

Updated: July 2020, description and status

Flightime guide

Distribution Map

Historical distribution at tetrad resolution
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Record Density

As above but the larger the symbol, the greater the number of records
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