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Discussion in 'Issues, Disease and Pests' started by Gerrit, Mar 24, 2023.
What could be the cause of this deformation and discoloration of the leaf of this Masdevallia?
Is the plant still producing new growths successfully? I read that bean yellow mosaic virus can infect Masdevallias and lead to aborted new growths among other things. That's really just a shot in the dark though, so take it with a grain of salt.
This is certainly not a firm diagnosis, but my first suspicion would be fertilizer salts accumulation in the medium, or an imbalance due to overdosing something.
For example, N, Ca, and K can compete for sites within the plant, an excess in calcium or potassium can reduce the uptake of nitrogen.
Your plant is dying, you should give it to me for disposal, unless it's a cool grower, cool growers will destroy the harmony of my compost pile .
Bean Yellow Mosaic Virus doesn't cause the deformed leaves, but other viruses associated with it will do that. I have tested masdevallias with curved leaves for ORSV and CymMV and they tested positive. I've forgotten which one it was. I would isolate that plant from others or dispose of it all together.
BMYV shows the mosaic pattern on the new leaves and which then fade as they age a bit. I've not seen the splotchy nature of the color disruption. It is normally opaque and translucent patches in a mosaic pattern most easily seen by looking at the leaf with a light source behind it.
Your plant is no longer dying and my composting services are no longer available.
Thank you all for your reply. Not sure what to do next. If it's a virus I should dispose of the plant but how do I now if it's a virus? How do you test it?
I don't know what test kits are produced in the EU (given the size of the orchid-producing industry especially in the Netherlands I strongly suspect that someone is manufacturing these) but Rega Biotechnology in Taiwan sells them (for ORSV and CymMV) and ships internationally - the down side is that the minimum order is 50 tests, but perhaps you can get a group together to share. The various bits of the test (buffer, strip, mixing stick) are packaged individually so the package of 50 is easy to to divide.
(The underlying technology of the orchid virus test kits is the same as the COVID tests that we all have come to know and love... Whether tests are manufactured for any particular virus is only a matter of demand - and therefor economics.)
Thanks Roberta, that's useful information.