Moths of North Carolina
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View PDFGeometridae Members: 109 NC Records

Dichorda iridaria (Guenée, [1858]) - Showy Emerald


Taxonomy
Superfamily: Geometroidea Family: GeometridaeSubfamily: GeometrinaeTribe: NemoriiniP3 Number: 910634.00 MONA Number: 7053.00
Comments: One of four species in this genus that occur north of Mexico and the only one that occurs in the East (Ferguson, 1985). We probably have only the nominate subspecies over most of the state, but the southern form -- Dichorda iridaria remotaria -- reaches at least the Santee River basin in South Carolina (Ferguson, 1985) and could potentially turn up in our Coastal Plain.
Identification
Field Guide Descriptions: Covell (1984); Beadle and Leckie (2012)Online Photographs: MPG, BugGuide, iNaturalist, Google, BAMONATechnical Description, Adults: Forbes (1948); Ferguson (1969, 1985)Technical Description, Immature Stages: Ferguson (1969, 1985); Wagner et al. (2001); Wagner (2005)                                                                                 
Adult Markings: A medium-sized, vibrant emerald-green Geometrid, with two broad white stripes that run a slightly curved but even course across the wings. Nemoria species are similar in size but have narrower and often waved or dentate lines. The apex of the forewing is also more pointed in Dichorda and the costa is white with dark speckling towards the base. No terminal line is present, as in some of the Nemoria, and the fringes are white.
Forewing Length: 11.5-15 mm, males; 15-16 mm, females (Ferguson, 1985)
Adult Structural Features: Both male and female genitalia are distinctive. Male valves are simple, lacking the basal and distal processes found in Nemoria (see Ferguson, 1985, for details and illustrations).
Adult ID Requirements: Identifiable from good quality photos of unworn specimens.
Immatures and Development: Larvae are brown with a series of broad, wing-like dors-lateral plates extending from the second thoracic segment to the fifth abdominal segment; two hook-like projections extend upward and forward from the 8th abdominal segment (Wagner, 2005).
Larvae ID Requirements: Identifiable from good quality photos, especially where associated with known host plants.
Distribution in North Carolina
Distribution: Occurs statewide, from the Barrier Islands to at least the Low Mountains; we have no records, however, from sites located above 4,000 ft.
County Map: Clicking on a county returns the records for the species in that county.
Flight Dates:
 High Mountains (HM) ≥ 4,000 ft.
 Low Mountains (LM) < 4,000 ft.
 Piedmont (Pd)
 Coastal Plain (CP)

Click on graph to enlarge
Immature Dates:
 High Mountains (HM) ≥ 4,000 ft.
 Low Mountains (LM) < 4,000 ft.
 Piedmont (Pd)
 Coastal Plain (CP)

Click on graph to enlarge
Flight Comments: Adults fly during most of the growing season, from March to September or October. Two main peaks or broods occur in the mountains, three in the Piedmont and Coastal Plain
Habitats and Life History
Habitats: We have records from a wide range of open habitats, including maritime dunes, lake shorelines, sandhills, and old fields. We also have records from woodlands, or from at least along their edges.
Larval Host Plants: Stenophagous, feeding on Poison Ivy and Sumacs (Wagner, et al., 2001).
Observation Methods: Comes well to blacklight and we have at least one record from bait
Wikipedia
See also Habitat Account for General Sumac Thickets and Poison Ivy Tangles
Status in North Carolina
Natural Heritage Program Status:
Natural Heritage Program Ranks: G5 [S5]
State Protection: Has no legal protection, although permits are required to collect it on state parks and other public lands.
Comments: Broadly distributed, occupying a wide range of habitats, and feeding on common-to-abundant host plants, this species appears to be secure in North Carolina

 Photo Gallery for Dichorda iridaria - Showy Emerald

36 photos are available. Only the most recent 30 are shown.

Recorded by: R. Newman on 2021-09-07
Carteret Co.
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Recorded by: R. Newman on 2021-09-07
Carteret Co.
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Recorded by: Owen McConnell on 2021-07-20
Graham Co.
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Recorded by: Jim Petranka on 2021-05-19
Madison Co.
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Recorded by: tom ward on 2021-05-18
Buncombe Co.
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Recorded by: R. Newman on 2021-04-17
Carteret Co.
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Recorded by: Michael P. Morales on 2021-04-16
Cumberland Co.
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Recorded by: Simpson Eason on 2020-06-30
Durham Co.
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Recorded by: Jim Petranka and Becky Elkin on 2020-05-16
Madison Co.
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Recorded by: Jim Petranka and Becky Elkin on 2019-05-07
Madison Co.
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Recorded by: David George on 2018-09-11
Durham Co.
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Recorded by: Gary Maness on 2018-09-05
Guilford Co.
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Recorded by: Vin Stanton on 2018-07-12
Buncombe Co.
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Recorded by: J. A. Anderson on 2018-05-18
Surry Co.
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Recorded by: Jim Petranka and Becky Elkin on 2018-05-11
Madison Co.
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Recorded by: K. Bischof on 2017-05-09
Burke Co.
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Recorded by: Darryl Willis on 2016-09-12
Cabarrus Co.
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Recorded by: Stephen Hall on 2015-08-14
Cherokee Co.
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Recorded by: B. Bockhahn, P. Scharf, S. Hall on 2015-07-22
Stanly Co.
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Recorded by: B. Bockhahn, P. Scharf, L. Amos on 2015-05-12
Warren Co.
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Recorded by: j.wyche on 2014-08-24
Gates Co.
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Recorded by: Jim Petranka and Becky Elkin on 2014-05-26
Madison Co.
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Recorded by: j.wyche on 2013-08-26
Gates Co.
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Recorded by: j.wyche on 2013-08-13
Gates Co.
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Recorded by: j.wyche on 2013-08-13
Gates Co.
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Recorded by: Jim Petranka and Becky Elkin on 2013-07-17
Madison Co.
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Recorded by: K. Bischof on 2013-07-10
Transylvania Co.
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Recorded by: Lenny Lampel on 2013-04-20
Mecklenburg Co.
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Recorded by: Doug Blatny / Jackie Nelson on 2012-05-27
Ashe Co.
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Recorded by: K. Bischof on 2011-04-28
Beaufort Co.
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