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Species Loxostege munroealis - Beet Webworm Moth - Hodges#5004

Beet Webworm - Loxostege munroealis Yellow moth - Loxostege munroealis Yellow moth - Loxostege munroealis Beet Webworm Moth - Loxostege munroealis Crambidae: Loxostege sticticalis - Loxostege munroealis  Beet Webworm  - Loxostege munroealis Moth - Loxostege munroealis Beet Webworm Moth - Hodges#5004 - Loxostege munroealis
Show images of: caterpillars · adults · both
Kingdom Animalia (Animals)
Phylum Arthropoda (Arthropods)
Subphylum Hexapoda (Hexapods)
Class Insecta (Insects)
Order Lepidoptera (Butterflies and Moths)
Superfamily Pyraloidea (Pyralid and Crambid Snout Moths)
Family Crambidae (Crambid Snout Moths)
Subfamily Pyraustinae
Genus Loxostege
Species munroealis (Beet Webworm Moth - Hodges#5004)
Hodges Number
Synonyms and other taxonomic changes
Loxostege munroealis Leraut, 2005 (1)
Loxostege sticticalis of authors (not Linnaeus, 1761) (2)
Explanation of Names
Loxostege munroealis Leraut, 2005, n. sp., Nouv. Rev. Entomol., 22(2): 134. This name applies to the North American species formerly treated as Loxostege sticticalis (Linnaeus, 1761) in Munroe (1976)(3).
wingspan 24-29 mm
larvae to 40 mm
Adult: forewing fringe scales black, contrasting with thin yellowish band along outer margin; ground color yellowish-brown with patchwork pattern of light and dark blotches; PM line very wavy, with a pale area distal to the line where it meets the costa; at rest, outline of moth is triangular

Larva: pale green when young, becoming olive-green and then black with age; black dorsal stripe with two pale stripes on either side, and two rows of paired circular marks
Manitoba to Texas and westward; sporadic eastward to the New England states
Holotype: "USA, Colombie Britannique, Rutland Bay".
Paratypes: USA: MD, CO; Canada: Riding Mt. Natl. Park, MT, Dunnville, ON.
fields, gardens, waste places
adults from May to September
larvae from June to October
larvae feed on wormwood and mugwort (Artemisia spp.), beets, sugarbeets, canola, flax, and spinach
Life Cycle
two generations per year; larvae overwinter in soil and pupate within silken cocoons in the soil in late spring; first generation adults emerge in May
See Also
Loxostege sticticalis, now considered extralimital to North America, is separated by appreciable differences in larval characteristics, noted by Munroe (1976)(3), and slight differences in wing pattern, genitalia (2) and DNA(4).
Print References
Linnaeus, C. 1761. Fauna svecica, (1354): 352. (2)
Powell, J.A. & Opler, P.A., 2009. Moths of Western North America p.174, pl.22.28. (5)
Works Cited
1.Contribution à l'étude de quelques genres et espèces de Pyraustinae (Lepidoptera: Crambidae)
Leraut, P.J.A. 2005. Nouvelle Revue d'Entomologie, 22(2): 123–139.
2.Fauna svecica, sistens animalia Sueciae regni: mammalia, aves, amphibia, pisces, insecta, vermes.
Carl Linnaeus . 1761. Stockholmiae, Sumtu & Literis Direct. Laurentii Salvii. Editio Altera Auctior. 1-578.
3.The Moths of America North of Mexico - Fascicle 13.2a - Pyralidae: Pyraustinae
Eugene Munroe. 1976. The Wedge Entomological Research Foundation.
4.BOLD: The Barcode of Life Data Systems
5.Moths of Western North America
Powell and Opler. 2009. UC Press.
6.North American Moth Photographers Group