Isabella tiger moths signal shift toward fall

September 20, 2026
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adults observed on 2026-09-16 at Greenland Ave, Oconomowoc and 2026-09-07 in Oconomowoc represent the tail end of the second brood season.1 Adults fly through September and then caterpillars seek winter shelter; these sightings mark the transition into the autumn dispersal that precedes dormancy.1

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