Poison spells seem to work ok on 'em, but I can't get a disease based DoT to stick to save my soul. Not even spells that reduce Disease resists! ?

Blue Diamond
Diamond
Ethereal Parchment
Fungus Clump
Grain of Burning Sand
Jord Meat
Pauldrons of the Eternal Storm
Peridot
Raw Diamond
Sandstorm Gem
Sandstorm Medallion
Sandstorm Pearl
Spectral Parchment
Strand of Ether
Sunshard Ore