I have now lost a second S. 'Tarnok' to this beast and I really am getting sick of it. I am not sure exactly what it is but here is the profile:
The plants grow just fine and then one day they suddenly lose turgur pressure. Looking at the rhizome you can not see any sign of disease but if you give it a squeeze odds are it will squish somewhere along the length. Cutting the rhizome open reveals that it is mostly brown throughout with white only at the leading end, more often than not it is the area that has roots that is struck the hardest. No actual sign of fungus and no trace of pests. Anyone have any idea what this is and how to beat it?