help with disease ID

[hanzy08]

Hello everybody! just seeking help in identifying these infections or whatnot that has been developing in two of my plants. If you can help with treatment plans that would be awesome too! thanks in advance!
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[jkofferdahl]

The top photo particularly concerns me; it shows the plant's newest leaf with a necrotic spot ringed by a brown area. A fungal infection can leave such a mark, but I'd worry about a viral infection.

[hanzy08]

I was thinking the same thing. I just don't know how to approach this. I really just want to cut it off. It started about a year ago on the original stalk then the plant decided to put out 4 keikis and the keikis started developing it as well.

[jkofferdahl]

I'd separate the plant from all others, and keep it there. And remember, too, that it could also be a fungal infection. Some fungi manifest very similar symptoms. How do the flowers from the plant look?

[rbarata]

Not an expert on the subject but, from what I've learned here, I think without testing it might be difficult to determine if it's a virus or fungal, unless the flowers are deformed which is a symptom of virus. Probably that's why jkofferdahl asked about the flowers.

[estación seca]

Call the bio department at your local university. I bet they'll help you figure it out. If they have anybody interested in plant pathology on the faculty they'll probably want you to take a piece in for them to look at.

[hanzy08]

Thanks everybody. when one of the plants flowered, the flowers were not deformed but the spots and discoloration has not manifested itself. When it sent out a spike the last time, the spike rotted and that is when the plant started developing the dark spots. It hasn't flowered since then. the cattleya has not flowered for me as it suffered from severe burn 2 years ago and it took a while to recover. It just started developing the brown, protruding tissue recently.

[Orchid Whisperer]

The vandaceous plant appears to have fungal issues. The necrotic areas are similar to what I have seen after plants get milder cases of sunburn. I agree that as a precaution, the plant should be isolated but also try treating for fungus.

The Cattleya, do the spots rub off? if yes, may be scale insects, treat with systemic insectticide.

[hanzy08]

I might have to destroy the neostylis orchid as it seems virused. the Cattleya according to my search is edema which is a result of the excessive uptake of water faster than the leaves can utilize it. It usually happens when the plant is watered during cooler weather which made sense in my environment.

[Orchid Whisperer]

Originally Posted by hanzy08

I might have to destroy the neostylis orchid as it seems virused. the Cattleya according to my search is edema which is a result of the excessive uptake of water faster than the leaves can utilize it. It usually happens when the plant is watered during cooler weather which made sense in my environment.

The Neostylis may or may not be virused but if you can replace the plant, then plant destruction is always a safe way to go.

Edema is a reasonable conclusion for the Cattleya, if those bumps are securely attached. No "cure", but cultural changes can reduce the possibility of it recurring.