IPM1019, New February 2003
Viceroy caterpillars (Limenitis archippus) are present from early summer to fall. They produce two generations per year.
The full-grown caterpillar is about 1.5 inches long with white mottled patches of white-pink and green-brown. Arising from the second thoracic segment is a pair of large, brown spines or horns that are barbed. A pair of much smaller barbed tubercles, white to light green, is found on the other body segments. Host plants include willow, elm, poplar, oak, aspen and wild cherry.
Brush-footed butterflies, fritillaries and wood nymphs belong to the Nymphalidae family. Caterpillars have variable color patterns ranging from longitudinal stripes to mimicking a bird dropping. Most species are covered with prominent spines and tubercles.
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