BehaviorOne generation per year occurs in the north, and two or more occur in the south.
ReproductionCaterpillars are covered with long setae, in tufts. They vary from yellowish and orange through dark gray. Extra long 'hair pencils' of white, black, and/or orange occur at both the front and rear of a caterpillar.
Larval head capsules are bright orange. In the north, mature caterpillars are found from July to frost. Caterpillars frequently rest on the upper surface of leaves, and though not gregarious, they are very conspicuous. They grow to a length of 35 mm.
FoodLarvae are known to feed on some species of alder, ash, birch, blueberry, chestnut, elm, grape, hackberry, hazel, oak, walnut, willow, and many others. No serious injury to trees has been reported for this late-season feeder.
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