Eggs are laid in August and the embryo immediately starts developing during the warm days of summer. In a month, the tiny larva is fully formed and ready to hatch. At this point, however, the larva goes into diapause, shutting down metabolic activities and becoming insensitive to cold.
In suspended animation, the larva passes the winter within the egg. As temperatures increase in early spring, the larva inside the egg slowly becomes more active. In mid-May, just as the leaves of trees are expanding, the larva chews through the egg shell and hatches.
Larva Stage >