Range of the Io moth includes much of the eastern half of the United States. The caterpillar (Photo 1) feeds on foliage of a wide variety of plants, including clover, grasses, various herbaceous and crop plants, shrubs, and some hardwood trees. Some trees listed as hosts are apple, black locust, cherry, hackberry, hickory, maple, and oak.
Females lay eggs in clusters. Larvae are present during June-October. The number of generations per year varies within the range. Two generations probably occur in Alabama. The full-grown caterpillar (Photo 1) is 60-65 mm long. Head and body are yellowish green. There is a broad white line along each side, bordered above and below by thin red lines. Prolegs and thoracic legs are red. Raised tubercles bearing whorls of branched spines occur on each segment along the back of the body. Spines are poisonous and can cause severe nettling when brought in contact with skin.
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All photos courtesy of Lacy L. Hyche