Lc. Renate bacterial infection?

[Gage]

I bought this in January with 5 other young Catts. They have all been growing new leaves and roots since then. I noticed this black speckling and yellowing on the tip of the affected leaf, which was covered by the end of an Onc. Sharry Baby. I'm guessing with all the rain lately, whammo! Can anyone confirm what this disease is and what to do about it? Please help! Thank you in advance.

[Paul Mc]

While I'm not sure and am interested in what people say, I just had to comment that I love the lush backyard you have there! Hope someone can assist you.

[silken]

I would cut it off in the meantime if you haven't already. sorry, not sure what it is, but it's no help to the plant like that.

[Gage]

Originally Posted by silken

I would cut it off in the meantime if you haven't already. sorry, not sure what it is, but it's no help to the plant like that.

True, thanks.

[Gage]

Bump. Help please?

[dounoharm]

cut it off and treat it with physan....it hasnt gotten to the new growth so you will be fine....

[Eyebabe]

Pseudomonas (Acidovorax), Erwinia or some other bacterial infection.

Remove the leaf asap; the whole leaf and watch the residual bulb for disease. If you feel it's traveling down the bulb. Cut again with a sterile blade and be well into (1-2 inches) healthy tissue.

[Gage]

Originally Posted by Eyebabe

Pseudomonas (Acidovorax), Erwinia or some other bacterial infection.

Remove the leaf asap; the whole leaf and watch the residual bulb for disease. If you feel it's traveling down the bulb. Cut again with a sterile blade and be well into (1-2 inches) healthy tissue.

It's on the whole plant as far as I could see this morning. I will look for any parts without speckling, but if I can't find any clean piece to save do I just throw it out?

[Eyebabe]

Originally Posted by Gage

It's on the whole plant as far as I could see this morning. I will look for any parts without speckling, but if I can't find any clean piece to save do I just throw it out?

I would not. Cattleyas are pretty resilient.
I did not think the rest of the plant looked all that affected.

I recommend treating with Physan for an immediate treatment. Pseudomonas is NOT killed by Physan though so you will also need to treat with a copper fungicide (such as Phyton 27).
It takes about a week for the copper fungicide to really be effective.

Isolate the plant after treatment and watch it.

I rarely loose a catt to pseudomonas anymore; it's usually the phals

I generally fear the brown rot or pythium with my catts.
That said, pythium can look like bacterial disease. It is usually lightning fast at "doing a plant in". If you suspect pythium, then "yes" pitch the plant. If you don't have Subdue Maxx, it will die anyway and it's highly contagious.

So when my catts get acute disease, I treat mostly for pseudomonas and "watch" for pythium.

Fusarium wilt is another disease catts get but that is slow and "insidious" and definitely NOT what I see here.

[orchidsamore]

Your plant does not look like fungus.

Old leaves die in this manner

If the black was circular or near the pseudobulb connection it would be a more convincing sign of fungus.

Here is a photo heavy tutorial on fungus and how to recognize it. Pythhion and Fusarium fungus on Cattleya

You should cut the leaf on your plant or any plant when you are not sure if it is sick. There is no chlorophyll in the leaf so it has no value to the plant. If you have not cut the leaf yet, probably the leaf will have fallen off by itself by now. Plants will shed old leaves whereas fungus leaves will not fall off and keep spreading to kill the plant.