Mild autumn has given problem

[Jack Harrison]

Problem with my home bred Orange Tips (larvae from my Sweet Rocket). The 25-or-so pupae have been in a box outside and in the shade. Now is my traditional time to bring them into the fridge so that they don't emerge too early next spring - tried and tested method over 50 something years. But one male pupa is coloring up. I don't know if it will remain dormant at around +5C or +6C but if it does emerge, then it clearly has no future. Maybe this sort of thing happens in the wild so warm autumns might be very bad for some species.

Jack