Overwintering Techniques > Refrigerator--Speyeria unfed First Instars

The greater fritillaries (Speyeria spp.) and some lesser fritillaris (Boloria spp.) overwinter as unfed first instars and can die easily during the winter. This occurs because these small larvae are extremely susceptible to desiccation on the one hand (insufficient humidity or airflow) or mold on the other hand (too much humidity with insufficient airflow.)

The following presentation provides a step-by-step tutorial of one successful strategy of how to keep Speyeria unfed first instar larvae alive for up to 180 days in the refrigerator.

Special thanks to Abe Homan for providing this detailed information as well as photographs.