Brassia Titanium Treasure with Black Marks on Leaves
 

Hello folks,

As part of my new-found love of orchids, I acquired a brassia titanium treasure that has been blooming for over a month now. I noticed that some of the leaves have black stripes and or dots (attached photo). I'm worried that this might mean disease. Should I be cutting any leaves off where I'm seeing the black markings? I'm wondering too, if I need to get a fungicide for the leaves and if I should repot the plant once the blooms are done. I do see that there are quite a few healthy-looking roots (white with light green tips) both in the bark and above the surface. Thanks for any advice! ~ Jessica, in the Northern climes of Canada

Brassia Titanium Treasure with Black Marks on Leaves
 

Duplicate post

This kind of spotting is common on Oncidium relatives growing in homes. It doesn't mean anything is wrong. I would not treat with anything, nor cut off leaves.

Do some reading in the Oncidium forum. Most Oncidium and related hybrids are rewarding and easy to grow in homes. Many flower more than once a year.

Perhaps a moderator can remove the accidental second post.

As a general rule of thumb, avoid cutting any part of an orchid that is still green.

There are exceptions I'm sure but this is a good practice to keep in mind.

This. Just because a leaf is not picture-worthy doesn't make it bad. I'm not entirelly sure how the dotting correlate to photosyntesis, but i would bet on the fact that the leaf is still an asset to the plant, otherwise it would be the one to drop it.
I would go as far as to say don't remove yellow leaves as well, unless they snap at the connection point under a very light bend; if they stick, it means they are either still making food for the plant or converting cells into something else. Quite a few trees are decently efficient at retaining clorophyl from dying leaves, either storing it away or turning it into building blocks. While it may not apply to many or any orchids, it's always best to let it tell you when something bad become redundant, for whatever reason (dotting, rotting, sunburn or age related damage)

RE your question about repotting. I don’t see any need to repot unless the media is breaking down. The size of the pot is fine for another year or two in your climate - and the less disturbance the better.

No visible need for the fungicide either.

good choice of orchid - good hardy beginners orchid.