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Old 01-31-2018, 12:42 PM
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Phalaenopsis with disease?

Hello. This is my first post however I have been reading helpful posts on here for a while. I wondered whether anybody can help me? I have a phalaenopsis orchid which I have had for a couple of years. It was a rescue originally but is currently flowering and has a healthy root system. Last summer it started to develop yellow spots on a couple of its leaves which I put down to too much light/heat. However, it seems to be progressing and as a relative newbie to understanding orchids, I'm unsure whether this is something more sinister that needs treating? The older leaves are getting worse and it is also now apparent on one of the newest leaves. I have done some research but have been unable to come to a final conclusion about what it may be. I wondered about mites but when I wipe the bottom of the leaf, there is nothing on the tissue? A couple of the flower spikes are also now going black which worries me. I'd hate to lose this orchid and am desperate to know what I can do for it? Many thanks, Sarah

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Old 01-31-2018, 02:31 PM
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Couple questions. How long have you had the plant? What are your growing conditions like, light, temp etc...
In some respects it looks like critter damage but I'm leaning more towards a fungal infection will require a fungicide....
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Old 01-31-2018, 06:21 PM
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I have had the plant for about 3 years now. It had been severely overwatered when I got it so it was a rescue project that had seemed to be doing well. It has always been in a west facing window that gets natural light but not direct sunlight. I'm not sure on exact temperatures but will range between 16-21C depending on weather. Temperature does drop overnight. There is some humidity in the room (kitchen) but I have recently placed them on humidity trays to help with this. It has always seemed happy in this position with good roots and frequent flowering, often from same spikes. If this is fungal, is there a fungicide that is recommended for orchids that I can find in UK? I read about using hydrogen peroxide...does that work?
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Old 02-01-2018, 02:43 AM
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I have never seen that before, I would go with -k-
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Old 02-01-2018, 05:46 AM
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Hi orchidgirl.
I have used physan 20. I have read about peroxide but have never personally used it for this type of application. When did this issue start, has it been gradual or fairly rapid?
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Old 02-01-2018, 05:59 AM
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It started last summer when weather was hot - as a beginner I thought it may be due to that. It has been gradual since then although it has appeared quickly on the newest leaf.
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Old 02-01-2018, 06:48 AM
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Ok, then I would recommend treatment with a fungicide and separate from any other plant to prevent cross contamination. I would also recommend cutting the flower spike off from the base of the plant if it is no longer in bloom. This will further help the plant recover.
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Old 02-01-2018, 07:03 AM
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Thank you for your advice. I have quarantined it away from other orchids and will treat with a fungicide. It is currently flowering beautifully...can I wait until it finishes flowering to cut the flower spikes or could waiting make it more difficult for it to possibly recover?
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Old 02-01-2018, 07:12 AM
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You can allow it to finishing flowering before cutting back the spike. Just be sure not to treat the flowers with the fungicide. The reason I do recommend a treatment like physan 20 is it's a disinfectant, fungicide, virucide, and algaecide. Good luck! Keep us posted!
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Old 02-01-2018, 07:50 AM
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That's great. Thank you!
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