Can this be leaf rot?

[morphiii]

I saw 2 circular yellowish spots on the leaf of one my phals. this morning about 4 mm across.

They looked discolored and sunken but is not a hole yet. Is that rot?

I also noticed some very tiny black specks (spores?) on the leaves of my catt. some of them I can scrape off by wiping but some are kinda embedded into the leaves. Are these fungus spores? They are not causing any problems on my catt. yet but should I try to remove all the specks?

I will post some pictures later.

[Ak_Orchid]

Pictures would help a lot, but without them i'll take a guess and say maybe scale? If you can scrape them off, then that's my guess.

[morphiii]

here are some pictures, please help

[Cynthia, Prescott, AZ]

I'd look closely for insects. You may want to use a strong magnifying lass, first on the back of the leaves, then the front, then at the base of the bulbs on the Catts.

[janet_a]

no, not rot on the phals.

[Aleksa]

I think that is leaf fungus. I have had the same problem. if those spots turn brown and then black, you will have to remove them with a knife... Fungus can be very dangerous!

[Cynthia, Prescott, AZ]

I don't think I would be removing any part of a leaf for black spot fungus, but if it starts to spread, then it is probably not fungal, but bacterial (usually with a wet look), and that should be removed with a little edge of uninfected material to be sure you get it all. At present, I would not remove anything. Need to wait to see if there is any spreading. I have used a black marker to dab a small dot at the current perimeters to note any spread. But then, I have so many plants, that memory of one plant is a little iffy.

Black spots are usually due to poor culture, and wet and cold conditions. It probably won't get worse, but you will have to let the plant out grow those old leaves before you will have a particularly nice looking plant again. Nothing will make them go away.

[morphiii]

The two spots are not getting any worse as far as I can tell.

I found another new problem today, there is a black spot on the tip of one of the pseudobulb on my catt..

What is it, looks like a burn mark? Fungus? Rot?

What?

[Cynthia, Prescott, AZ]

Doesn't look like anything important. Probably old history. Maybe mechanical damage.

[digitalgate]

oh, this is a catt. I thought it was a oncidium. May be nonthing to worry about.