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For Insects, Spiders & Their Kin
For the United States & Canada
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Species Macronoctua onusta - Iris Borer - Hodges#9452

Iris Borer, side - Macronoctua onusta Iris Borer - Macronoctua onusta Noctuidae, Iris Borer, spent pupal case - Macronoctua onusta Macronoctua onusta? - Macronoctua onusta Moth found at my favorite bug spot - Macronoctua onusta Moth - Macronoctua onusta Gray-brown moth 2-inch wingspan - Macronoctua onusta strange moth - Macronoctua onusta
Show images of: caterpillars · adults · both
Kingdom Animalia (Animals)
Phylum Arthropoda (Arthropods)
Subphylum Hexapoda (Hexapods)
Class Insecta (Insects)
Order Lepidoptera (Butterflies and Moths)
Superfamily Noctuoidea (Owlet Moths and kin)
Family Noctuidae (Owlet Moths)
Subfamily Noctuinae (Cutworm or Dart Moths)
Tribe Apameini
Genus Macronoctua
Species onusta (Iris Borer - Hodges#9452)
Hodges Number
Synonyms and other taxonomic changes
Macronoctua onusta Grote, 1874
Phylogenetic Sequence # 932442
the only species in this genus in North America (1)(2)(3)(4)
forewing brown with darker brown or gray margins; AM and PM lines thin, black, and zigzagged; wingtips with several concave scallops; hindwing uniformly pale brown (1)(2)(3)(4)
eastern US and southeastern Canada, plus British Columbia (1)(2)(3)(4)
adults fly in September and October (1)(2)
larvae bore into iris plants and feed on the rhizomes (1)(2)
Life Cycle
see Internet Reference links below
Larva; Pupa; Adult:
much information on caterpillar damage and control on the web; see Internet Reference links below
Internet References
biology and control (U. of Florida)

Old Links: (not working anymore) updated 17 Jan 2024
pinned adult image (James Adams, Dalton State College, Georgia)
pinned adult image and semiochemicals (
biology and biocontrol (U. of Wisconsin)
biology and control (Virginia State U.)
biological control using nematodes (Canadian Iris Society)
color drawing of larva (American Iris Society)