When an undead turning beam is zapped over the corpse of an undead monster that’s set to revive, the corpse is either destroyed outright or the revive timer is canceled so it won’t revive. (In this second scenario, zapping the corpse again with no revive timer set on it could resurrect it like normal.)

When you zap a wand of undead turning at a corpse that has an undead form, unless there is a ghost above it, it will resurrect the corpse as that undead. Also do this for living monsters that have undead forms, subject to monster magic resistance.

You can apply a cursed bag of holding (or possibly empty bag of tricks) at a ghost to capture a ghost, which can then be used to recharge a wand of undead turning.