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Caterpillars feed on Apple (Malus), sweetfern (Myrica), Carolina rose (Rosa carolina), blueberry and huckleberry (Vaccinium), white spruce (Picea glauca), American larch (Larix laricina), and alder (Alnus). Caterpillars pupate in burrows in soft soil.
Me and my son found two of these while on an adventure walk yesterday out in our back 40. We now have 9 different larvae species we are observing. I find it very exciting.