Pseudomonas on Mature Catt?

[realoldbeachbum]

This large spot appeared on a very mature (but newly acquired) Blc Ports of Paradise ‘Emerald Isle’.

From looking at St. Augustine’s website, it appears to be Pseudomonas. Any thoughts? I have now isolated it – but only after it sitting one week among other Catts! I removed the affected portion and treated with cinnamon, then sprayed the plant with Physan.

Do you think it is, in fact, Pseudomonas? Any suggestions on what I should do next?

[Ray]

Frankly, to me that looks more dry than the "water-soaked" appearance of pseudomonas/acidovorax. Possibly an old burn.

If it is a bacterial infection, topical treatments like cinnamon and Physan won't do diddly. You're better off with a copper treatment.

[realoldbeachbum]

Thanks, Ray. I have copper, so I will give it a shot of it tomorrow just for good measure, I suppose.

[SouthPark]

ROBB ------ looks like good news for this case, as it doesn't look like anything nasty or serious. Agreeing with Ray too here.

Does this orchid get any direct sunlight on it? Catts can eventually be sun-hardened (gradual sun-hardening) to a point where they can handle a lot of sunlight ------ all except for certain yearly 'peak' harsh intensities. I got some catts that had burned leaves before from extra harsh peak intensity days of certain years ----- oops!!! --- but generally no problem when most of the orchid is ok.

I just put the orchid in another spot to hide out for a while, where the burned parts just dry up and blacken, and the orchid just continues growing. No problem at all. As long as that portion dries up and becomes hard and black coloured ..... or hard and brown coloured, then everything is just fine.

Any patches that dry right up, and turn hard ----- and doesn't appear to spread --- can generally mean healed, or no longer a health threat in that region.

[realoldbeachbum]

Thanks for the comments, SP and Ray!

I have only had the plant for 2 weeks (mail order), so I don't know what level of sun it had before. The other large leaves have no such spots, so one would think that sunburn would not be limited to this one spot. Don't ya think?

The spot and surrounding tissue were firm, not mushy. I suppose that is a good thing.

I removed the affected area already and isolated the plant. Today, I will spray down with copper and wait impatiently to see if anything develops.

Thanks so much!

[SouthPark]

Originally Posted by realoldbeachbum

so one would think that sunburn would not be limited to this one spot. Don't ya think?

Most welcome ROBB! If assuming - just assuming (but not necessarily) sun effects ----- I think sometimes it's tricky to determine which portions of leaves get affected first.

Sometimes can be a long patch, other times can be roundish localised regions. But dried and hard ------ that's a good sign.