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Several Milkweed Tussock Moth caterpillars on a common milkweed leaf.
Common milkweed, unplowed field, rural deciduous area, Clermont County
Tussock Moths are a known problem for people growing milkweed to raise Monarch caterpillars. Whereas Monarchs will lay one egg at a time, giving each hatchling its own leaf (and often its own plant) to feast on, Tussock Moths lay several eggs at once, leading to hungry legions of hatchlings like the one pictured above. They can decimate milkweed plants, depriving the endangered Monarchs of food.