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The Maple Spanworm, Ennomos magnaria, is one of our most striking geometer moths, large and stout, with a wingspan of about 43 to 60 mm (1 11/16 to 2 3/8 inches). The females are larger than the males. The wings are yellow-orange to orange-brown, dusted with small dark brown flecks, and the outer edges are deeply scalloped, as if notched. Together with the dark speckling, the shape makes the moth look like a dead autumn leaf. Our photo shows the top of a spread specimen. It looks most like the Selenia moths, but those fly earlier in the year and have pale bands or frosting on the wings, which the Maple Spanworm lacks.
The Maple Spanworm lives in mixed and deciduous forests and woodlots, and it is found most often in moist hardwood woods. It ranges from coast to coast across southern Canada and the northern United States, and south in the east to Florida and Louisiana. In the southeast it is commonest in the mountains.
Adults fly at night and come to lights. By day they may rest on buildings. They are one of the fall moths, flying from July to October or early November. Moths in the mountains appear earlier, and those on the coastal plain are rarely seen before October.
Complete metamorphosis (egg, larva, pupa, adult). The caterpillars are twig mimics, and they are found from May to August. They feed on the leaves of many trees and shrubs, including maple, alder, birch, hickory, beech, ash, holly, poplar, oak, willow, and basswood. There is one generation a year. We found no reliable information on the overwintering stage.
Not known as a pest. The caterpillars feed on the leaves of many wild trees and shrubs, and we found no record of significant damage to crops or forests.
Some of our specimens were collected near Ringgold, Georgia.
This preserved specimen educates on moth identification and the leaf-mimic geometers of autumn woodlands, suitable for displays or studies. Check it out on BugGuide! https://bugguide.net/node/view/9644/bgimage
The Maple Spanworm, Ennomos magnaria, is one of our most striking geometer moths, large and stout, with a wingspan of about 43 to 60 mm (1 11/16 to 2 3/8 inches). The females are larger than the males. The wings are yellow-orange to orange-brown, dusted with small dark brown flecks, and the outer edges are deeply scalloped, as if notched. Together with the dark speckling, the shape makes the moth look like a dead autumn leaf. Our photo shows the top of a spread specimen. It looks most like the Selenia moths, but those fly earlier in the year and have pale bands or frosting on the wings, which the Maple Spanworm lacks.
The Maple Spanworm lives in mixed and deciduous forests and woodlots, and it is found most often in moist hardwood woods. It ranges from coast to coast across southern Canada and the northern United States, and south in the east to Florida and Louisiana. In the southeast it is commonest in the mountains.
Adults fly at night and come to lights. By day they may rest on buildings. They are one of the fall moths, flying from July to October or early November. Moths in the mountains appear earlier, and those on the coastal plain are rarely seen before October.
Complete metamorphosis (egg, larva, pupa, adult). The caterpillars are twig mimics, and they are found from May to August. They feed on the leaves of many trees and shrubs, including maple, alder, birch, hickory, beech, ash, holly, poplar, oak, willow, and basswood. There is one generation a year. We found no reliable information on the overwintering stage.
Not known as a pest. The caterpillars feed on the leaves of many wild trees and shrubs, and we found no record of significant damage to crops or forests.
Some of our specimens were collected near Ringgold, Georgia.
This preserved specimen educates on moth identification and the leaf-mimic geometers of autumn woodlands, suitable for displays or studies. Check it out on BugGuide! https://bugguide.net/node/view/9644/bgimage
