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Old 03-23-2013, 02:31 PM
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phal problem

Does anyone know what caused this kind of spot on my phalaenopsis leaf ? It keeps getting bigger and started now on the edge of the leaf. There are no signs of insects and the plant looks otherwise healthy. There is also a small spot on one other that is next to it, so same environment. There is also another in the same environment that appears to by fine.
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Old 03-23-2013, 04:55 PM
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Not sure but one of my Phals had a spot appear in the middle of the leaf similar looking and it turned out that it was touching my cup of tea!!! (I know I shouldn't laugh about abuse of orchids!!! Sorry!!)
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Old 03-23-2013, 05:16 PM
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I can't tell from the photo, so here are some suggestions:

The spots could be bacterial if:
They are growing in size, or
There is sort of a halo or ring surrounding the spot, or
Tissue in the spot appears soft or even watery, or
There is an odor to them (rare in my experience).
Of course, any or all of the above may apply.

The spots could be entirely environmental (heat, cold, sunburn, etc.) if:
The spots are not growing in size,
They appear to be drying out rather than rotting,
The spots are firm, raised (could be edema).

Of course, environmental damage can be followed by bacterial damage.

I would keep an eye on it. if the spots are showing bacterial symptoms, consider cutting off the half of the leaf with the spots, using a flame-sterilized sharp knife.
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Old 03-23-2013, 05:20 PM
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Catt's reply was much more professional (and more helpful too!!) than mine!!!
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Old 03-24-2013, 12:23 AM
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Quote:
Originally Posted by Smurfette View Post
Not sure but one of my Phals had a spot appear in the middle of the leaf similar looking and it turned out that it was touching my cup of tea!!! (I know I shouldn't laugh about abuse of orchids!!! Sorry!!)

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Old 03-24-2013, 12:27 AM
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Thanks for all your input. The spot is growing slowly, took 2 weeks to get this size. It is dry, doesn't seem to be a rot. The spot is way thinner than the rest of the leaf and has a waffle kind of texture. The spot on the edge of the leaf is new, like 2 days old.
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Old 03-24-2013, 12:30 AM
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I would put isopropyl alcohol or peroxide on it to see if that stops the spreading. I have used both of theses on my orchids and it doesn't hurt.
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Old 03-24-2013, 01:05 AM
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I had this same problem, and after cutting off the parts of the leaves that were affected, I rubbed isopropyl alcohol all over the leaves, top and bottom, for a few days, and it solved my bacterial rot issue.
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Old 03-24-2013, 08:28 PM
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Thanks again for all your input
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