Hate to bump this, but as an FYI, the breeding stock of orchids in the US, has a lot of hereditary problems, due to inbreeding and limited genetic stock.
However yours seems most likely to be bacteria. I would keep the humidity in check.
Hello Fellow Mantid collectors,
The praying mantis big bit me several years ago when I was in a Entomology class.
since then I've expanded my collection to several mantis species. Ironically I've have an abundance of Chinese and orchids. Looking forward to discussing mantids as well as...