Oncidium with ORSV

[lepetitmartien]

I'm glad you tested it, as the only things I see are thrips attacks and Guignardia/Phyllosticta spots.

The only "reliable" marks (that is, to touch with a a three mile pole but still an indication not to treat like 1 cent coins) are repeated (I mean repeated) color breaks, and geometric chlorotic spots. And it can still be something else (cosmic rays or a fungus).

[edit]mixed up two fungi genus… and mispelled another corrected

[kindrag23]

Im sorry you are losing your new little baby...that really stinks...and any respective grower/seller should be better not to sell something that is remotely sick looking in my opinion, of course that is just me and my obsessive compulsive nature towards things that I sell and the way they look lol.

[DavidCampen]

Originally Posted by kindrag23

...and any respective grower/seller should be better not to sell something that is remotely sick looking in my opinion,

Orchids can often be carriers of ORSV without showing any obvious symptoms, at least for a while, but still be capable of infecting other orchids which then will exhibit significant negative effects. Much like a Typhoid Mary of the orchid world:
Typhoid Mary - Wikipedia, the free encyclopedia

I test my orchids using the Agdia Immunostrips that test for CymMV and ORSV.

[Sharry]

To David: "I test my orchids using the Agdia Immunostrips that test for CymMV and ORSV."

I do too except maybe a small plant that has not much to spare. So far I have gone through about 50 tests and have had about a dozen positives. Except a maybe a phal seedling all were mericlones. Mostly without obvious symptoms. The symptoms that were noted: The phal seeding would not grow, a kind of pale looking intrageneric, one phal that had pitted leaves and chlorotic spots and this Wilsonaria hybrid.


Leptitmartien: There are two patterns on this plant. One is the spotting {on the underside of the leaf the spots are dark brown.) The other pattern is black streaking. Maybe there is a co-infection? I have seen images on the web of orchid viruses causing black streaks but most of those image were CymV. (I work in research so this stuff gets the nerd gene switched on)

[lepetitmartien]

Guignardia/Phyllosticta shows up in 2 different ways: diamond shaped spots, and little black dots, there's both. What's "funny" is the line pattern but it's not incompatible.

The trouble with viruses is that they weaken the plant so there can be multiple diseases at the same time (and I don't believe all are accounted for already) and if there's co-infection with the current CYMV and ORSV, the result can be difficult to describe, and even then can be mistaken for something else.

You guessed right from a series of observations but it's the test that did the trick. The observations could have been "wrong" for a virus diagnose.

I'm currently geeking in the phytopathology domain, and the more I go thru, the more I see we don't know that much in fact. And precise diagnosis is difficult, in fact, we should be happy to tell without a lab that this is bacteria, that fungus and the other there virus infected. It works not that bad for bacterias and fungi, but certainly not for viruses.