Leaves spots

[Petr Zalesak]

Hello,
Could someone please help me to identify these spots at Cattleya leaves? They are at the bottom side and at the old ones only...
Thank you very much.

 

[gonewild]

Looks like virus.

 

[Jpari]

The pattern of black spots in both pictures look like virus to me. The pattern of spots in the second picture looks like classic
Odontoglossum ringspot virus. You may want to isolate this plant and certainly have it tested.

Search Results​

 

[Petr Zalesak]

The pattern of black spots in both pictures look like virus to me. The pattern of spots in the second picture looks like classic
Odontoglossum ringspot virus. You may want to isolate this plant and certainly have it tested.

Search Results​

Thank you.

 

[big923cattleya]

I respectfully disagree. This is not a virus it is bacterial brown spot, Psuedomonas sp.. It typically appears as fine dots on older Cattleya leaves, species or hybrids. A good anti bacterial will help prevent it like Physan. It is usually spread in crowded collections featuring Cattleyas. It is not exclusively found in Cattleyas but is often the worse in them when compared to other genera.
Do you have good air circulation within your collection? If you help things dry out quicker after watering, this might help fight the spread.

 

[jtrmd]

big923cattleya hit the nail on the head.​

 

[Jpari]

Well, the brown pattern on the leaf in the second pic really looks to me like many pics I have seen of Odontoglossum ringspot virus. Hopefully the OP will have it tested or test himself and update this post so that we know for sure. Speaking strictly from an educational standpoint threads like this where there is disagreement are valuable to us when the OP can give us a definitive answer to the question.