Pest,Bacteria,Fungal?

[Sharon's Sheepdogs]

Charlaux,

If it's not scale, it might be Oedema which is caused by overwatering. They are often confused with each other. If it's the pest, you should be able to remove it using a q-tip soaked in some alcohol. If the bump won't move, it could be Oedema. The following two websites contain photos and information describing Oedema:

PP244/PP164: Physiological Disorders of Orchids: Oedema

http://staugorchidsociety.org/PDF/Ed...ySueBottom.pdf

Hope this helps. By the way, I have purchased from this vendor in the past & have not had any problems. If it's Oedema, it's not a disease but occurs from improper culture which overwatering is. You can improve the health of this orchid by providing the proper culture.