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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