Another Oncidium Black Spot Post

[SteveM]

Hey All,

OK the picture below is of my Bellaria that I got about a month ago. The thing is still in full bloom and all the leaves are looking very healthy, no leaf tip die back, no spotting on the main leaves. It is in my living room right now getting lows light and good air circulation. All the bracts of the pseudo bulbs have these black dots and have no yellow halo. I had these when I got the orchid. There was a lot so its hard to tell if it is spreading, I do not think so. they aren't getting any bigger anyways, I have sprayed with a copper fungicide, and with a systemic just today, about 2 weeks apart. They haven't responded to the copper treatment, did 2 treatments 2 weeks apart, and too early to see if terbuconazole is going to do anything. I really don't think its bacterial, I am doubting right now fungi, so its left with viral or mechanical or genetics or calcium deficiency. The weird thing is the leaves look beautiful, just the side bracts are affected. Picture is below. The psedo bulbs were severly dehydrated when I go it and they have been slowly getting better, Had another Allicearia with shriveled bulbs that took a few months to get the wrinkles out of them. Im planning on starting to fertilize with some calcium nitrate next week. Any ideas what these may be? Thanks all for all your help in the past, present and future.