Blackthorn.
Black thorn is a wood said to be effective in slaying vampires.
Blackthorn’s supernatural power is believed to come from its association to Christ and the crown of thorns he wore during the passion of the crucifixion. It’s believed only Blackthorn can kill Lastovo Island vampires.
If placing a stake over vampires grave it will prevent the devil that inhabited the corpse from escaping. It also helps vampire hunters to beat the devil with it.
Mari Wells 
I have an old blackthorn root walking stick in the garage somewhere.