During what months does the adult emergence period for *Operophtera brumata* generally occur?
Answer
October and December, sometimes extending into early January.
The timing of adult emergence for the Winter Moth is highly unusual for Lepidoptera, taking place in the colder parts of the year, which is why they are observed active when temperatures dip low. The general consensus for the flight period is concentrated between the beginning of October and the end of December. Depending on the specific local climate conditions prevalent in a given year or region, this activity window can occasionally stretch slightly later, sometimes reaching into early January. This short, compressed flight window is essential for reproduction before severe freezing conditions halt activity entirely.
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