Contrary to popular alarmist belief's, most fungi are not pathogenic, rather they are just scavengers, and quite beneficial, but sometimes they can be opportunistic. If your plants had already formed their Winter resting buds, before you refrigerated them, the visible mold may just be colonizing the dead outer leaves, which is a good thing. Be careful using synthetic chemical fungicides, they might just kill the beneficial fungi, leaving an opening for more aggressive and pathological types. Most fungicides do not kill all fungi.