Orgyia leucostigma
| White-marked tussock moth | |
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| Adult | |
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| Larva | |
Scientific classification 
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| Domain: | Eukaryota |
| Kingdom: | Animalia |
| Phylum: | Arthropoda |
| Class: | Insecta |
| Order: | Lepidoptera |
| Superfamily: | Noctuoidea |
| Family: | Erebidae |
| Genus: | Orgyia |
| Species: | O. leucostigma |
| Binomial name | |
| Orgyia leucostigma (J. E. Smith, 1797) | |
| Synonyms | |
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Orgyia leucostigma, the white-marked tussock moth, is a moth in the family Erebidae. The species was first described by James Edward Smith in 1797. The caterpillar is very common especially in late summer in eastern North America, extending as far west as Texas, California, and Alberta.[1]
Etymology
The genus name Orgyia is from the ancient Greek word ὄργυια, órgyia - 'outstretched arms'. So named because, when at rest, the moth stretches forward its forelegs like arms.
Life cycle
Two or more generations occur per year in eastern North America.[2] They overwinter in the egg stage.
Eggs
Eggs are laid in a single mass over the cocoon of the female, and covered in a froth.[2] Up to 300 eggs are laid at a time.
Larvae
The larvae are brightly colored, with tufts of hair-like setae. The head is bright red and the body has yellow or white stripes, with a black stripe along the middle of the back. Bright red defensive glands are seen on the hind end of the back. Four white toothbrush-like tufts stand out from the back, and a gray-brown hair pencil is at the hind end.[citation needed] The four white tufts on the larva's back may mimic the cocoons of parasitic wasps.[3] Touching the hairs sets off an allergic reaction in many humans.[2] Young larvae skeletonize the surface of the leaf, while older larvae eat everything except the larger veins.[4]: 72–73 They grow to about 35 mm long.
Pupae
The caterpillars spin a grayish cocoon in bark crevices and incorporate setae in it. The moths emerge after two weeks.
Adults
The females have reduced wings and do not leave the vicinity of the cocoon. The males are gray with wavy black lines and a white spot on the forewings (the vapourer, Orgyia antiqua, is similar but is a rusty color.) The antennae are very feathery. Moths are found from June to October.
Wingless female with eggs
Host plants
The caterpillars may be found feeding on an extremely wide variety of trees, both deciduous and coniferous, including apple, birch, black locust, cherry, elm, fir, hackberry, hemlock, hickory, larch, oak, rose, spruce, chestnut, and willow.[2] Defoliating outbreaks are occasionally reported especially on Manitoba maple and elm in urban areas.[4] Outbreaks are usually ended by viral disease.
Ecology
The fungus Entomophaga maimaiga was introduced to North America to control the spongy moth (Lymantria dispar). The fungus also infects O. leucostigma[5] and could possibly have an impact in years when E. maimaiga is abundant. Large larvae are mostly attacked by birds, and small larvae mostly disappear during dispersal.[6]
Subspecies
- O. l. leucostigma (South Carolina, from Georgia and Florida to Texas)
- O. l. intermedia Fitch, 1856 (from Maine and Ontario to Virginia, Alberta and Kansas)
- O. l. plagiata (Walker, 1855) (Nova Scotia, New Brunswick, Quebec)
- O. l. oslari Barnes, 1900 (New Mexico, Colorado)
- O. l. sablensis Niel, 1979 (Sable Island, Canada)
Image gallery
Larva
Larva
Larva
Larva
Larva
Larva
Caterpillar
Caterpillar in Texas
References
- ^ "Orgyia leucostigma (white-marked tussock moth)". CABI Invasive Species Compendium. CABI. 2019. Retrieved 4 August 2019.
- ^ a b c d Wagner, D. M. (2005). Caterpillars of Eastern North America. Princeton University Press. ISBN 0691121443 [page needed]
- ^ The BugLady (23 November 2010). "White-Marked Tussock Moth (Family Lymantriidae)". College of Letters & Science Field Station. University of Wisconsin Milwaukee. Archived from the original on 18 April 2023.
- ^ a b Rose, AH and OH Lindquist. (1982). Insects of eastern hardwood trees. Canadian Forestry Service, Forestry Tech Rep 29. Government of Canada, Ottawa. ISBN 0-660-11205-1.
- ^ Hajek, A. E.; Strazanac, J. S.; Wheeler, M. M.; Vermeylen, F. M.; & Butler, L. (2004). "Persistence of the fungal pathogen Entomophaga maimaiga and its impact on native Lymantriidae". Biological Control. 30 (2): 466–473.
- ^ Medina, R. F. & Barbosa, P. (2002). "Predation of small and large Orgyia leucostigma (J.E. Smith) (Lepidoptera: Lymantriidae) larvae by vertebrate and invertebrate predators". Environmental Entomology. 31: 1097–1102.
External links
- "Species Orgyia leucostigma - White-marked Tussock Moth - Hodges#8316". BugGuide. Retrieved May 16, 2020. With images.
