I noticed some black spots on the leaves of my orchid, the smaller ones have been on it since I bought it, but the larger ones have been expanding recently, which I'm pretty sure isn't a good sign. Could anyone help out? I've read the disease sticky, but I don't know if it's a virus or a fungus or something else. the plant stays in a shaded southern exposure, is watered about once a week, and is on a humidity tray. I'd appreciate any information on what it is, how to treat it, and if it can spread. Thanks!
