The pace of Eastern Tent Caterpillar (ETC) (Malacosoma americanum) development varies widely in southwest Ohio. However, some caterpillars have reached their final instar stage and are abandoning their highly visible silk nests located in branch forks to go on a crawl-about in search of pupation sites. Their abandoned nests will remain evident throughout much of the early summer as they gradually disintegrate.
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The accumulated Growing Degree Days (GDD) that predicts eastern tent caterpillar (ETC) (Malacosoma americanum) egg hatch is 92. Cincinnati has reached 89 GDD meaning that ETC eggs are poised to begin hatching in southwest Ohio. ETC spends the winter in shiny, blackish-brown egg masses wrapped around twigs on their host plants. A close examination will reveal that the eggs are encased in a structure that resembles bubble-wrap.
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