Dendrobium basal rot

[paphioboy]

Hi all. I'm having problems with rot of dendrobium pseudobulbs. This happens periodically and affects softcanes the most (anosmum, Nestor, nigrohirsute hybrids). The base of the canes turn bright yellow-brown, appear shrivelled and spreads through the rhizome until the whole plant is affected. What causes this and how do I prevent it from occurring in the future? Thanks..

Affected Dend Nestor (anosmum x parishii) keikis:

Affected anosmum:

 

[SlipperFan]

I've seen this also. I wish I knew.