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Caterpillars or Millipedes in Log Home? Millipedes Confirmed

1.5-inch dark, slender "caterpillars" in a NE PA log home are millipedes. Round, many legs, curl when dead. Harmless—feed on decaying matter. Invade in fall/spring after rain. Die indoors in 1–2 days (dry air). Vacuum. Seal foundation cracks, remove debris. Persistent cases: pyrethroid perimeter spray (bifenthrin, cyfluthrin, etc.).

Pests: Controlling Wasps in Gazebo Structures and Sprinkler Systems; Mystery Insects Swarming Long Island Home: Thrips or Something Else?; Massive Millipede Invasion in Basement After Flooding; Oak Loopers Defoliating Yard: Spinosad for Small Trees; Centipedes/Millipedes in Slab Home: Seal and Reduce Moisture; Identifying and Controlling Tent Caterpillars; Saving Petunias from Aphids and Caterpillars: Early Intervention Is Key; Forest Tent Caterpillars Defoliating Oaks in Manitoba; Omnivorous Looper Caterpillars on Magnolia; River Birch Sawfly Larvae: Not Caterpillars, Require Different Control

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