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Isabella Tiger Moth

Photo from Southern Illinois University


Common Names: Banded Woolly Bear, Tiger Moth, Isabella, Woolly Bear


Scientific Name: Order Lepidoptera, family Arctiidae, Pyrrharctia isabella


Size: Adult—2 1/4", larva—1 1/2"


Identification: Black, very fuzzy caterpillar. Red-brown band in the center on the body. Hairs are short, stiff, and bristly. Orange stripe. If more than one stripe, a cold winter is supposedly on its way. Commonly seen crossing roads in the spring and fall. They curl into a ball when disturbed. Adults are white or yellowish moths.


Biology and Life Cycle: Adult is the Isabella tiger moth. Caterpillars hibernate and spin a hairy cocoon in the spring. Adults emerge from the cocoon to lay eggs. The larvae hatch and undergo six molts, crawl around awhile, find a protected place to pupate, turn into adults that then lay eggs, which hatch into larvae that actively crawl around looking for a place to overwinter. Two generations a year. Complete metamorphosis.


Habitat: Dandelion, plantain, and low-growing weeds and grasses. Meadows, pastures, uncultivated fields, road edges, and urban landscapes.


Feeding Habits: Feed on low-growing herbaceous plants of many kinds, mostly wild. Will sometimes but rarely attack ornamentals and food crops.


Economic Importance: Little that we know of.


Natural Control: Parasitic wasps, birds, and flies.


Organic Control: None needed.


Insight: Folklore says that the more red bands, the longer the winter will be.





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