larval disease in butterfly house

[John Grehan]

A colleague of mine, Bob Snetsinger, is starting a butterfly
house. Recently some larvae died from what is presumably
a bacterial or viral disease (they turned black).

I would be grateful for any information or information sources on
dealing with this kind of problem in a glass house situation. Are
there recommended methods for sterilizing the glass-house after
infections of this kind, or for reducing the likelyhood of their
occuring.

John Grehan