Io Moth (Automeris Io)
CLOSE ENCOUNTERS WITH THE ENVIRONMENT What’s Eating You? Io Moth (Automeris io) Eric W. Hossler, MD; Dirk M. Elston, MD; David L. Wagner, PhD f the 7 species of Automeris moths (order, About 10 days after being deposited, minute 2- to Lepidoptera; family, Saturniidae) found in the 3-mm larvae emerge from the ova and feed gregari- O United States, Automeris io often is the most ously upon their host plant. Favorite foods of the Io common and familiar. Its range extends as far north caterpillars include azaleas, birch, blackberry, cherry, as Quebec, Ontario, and southern Manitoba, Canada; clover, cotton, currant, elm, hackberry, hibiscus, west to Utah, Colorado, Nebraska, and Texas; and mesquite, oak, pear, poplar, redbud, rose, sassafras, south to Florida, eastern Mexico, and Costa Rica.1-3 and willow.1,2,4 In addition, larvae frequently feed on Across much of its range, the moths and their lar- grasses such as corn or Bermuda grass.2,4 Io moths are vae are among the most common giant silk moths around in deciduous woodlands, forests, and fields; encountered by the public. In Louisiana, the closely along power line rights-of-way; and in orchards, related Automeris louisiana largely replaces the Io parks, and suburban yards.2,5 moth in coastal areas.2 The sexually dimorphic adults have a wingspan The Io moth has 4 life stages: egg, larva (or cat- of 2.0 to 3.5 in and are easily recognized by the pres- erpillar), pupa, and adult. Eclosion of Io moths from ence of prominent black to blue eyespots with white cocoons occurs during late morning or early evening.
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