Suspicious spots on renanthera
- Thread starter OrchidIsa
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Are the spots reddish purple?
It could be symptom of phosphorous deficiency.
What nutrients are you supplying?
The symptoms could appear suddenly due to an environmental condition like strong light or cold temperature.
It looks like the plant lost a leaf on the right side at one time? Was there a disease issue in the past?
What nutrients are you supplying?
The symptoms could appear suddenly due to an environmental condition like strong light or cold temperature.
It looks like the plant lost a leaf on the right side at one time? Was there a disease issue in the past?
OrchidIsa
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The leaves at the bottom were already gone when I got the plant a bit more than two years ago so I can't answer your question about disease in the past.
About the light and temps, the plant initiated in my orchidarium and then, I got it out and put it in my office with my other orchids (same artificial lighting, less humidity). Temps are a bit warmer in my office than in the orchidarium.
I put it out because of bud blasting last year. I feed with MSU in RO water, 3 weeks per month, at around 150 ppm.
Never noticed this kind of spots before.
About the light and temps, the plant initiated in my orchidarium and then, I got it out and put it in my office with my other orchids (same artificial lighting, less humidity). Temps are a bit warmer in my office than in the orchidarium.
I put it out because of bud blasting last year. I feed with MSU in RO water, 3 weeks per month, at around 150 ppm.
Never noticed this kind of spots before.
Are the roots active and healthy?
From what I can see in the picture it does not look like a disease.
From what I can see in the picture it does not look like a disease.
Do you have an idea of what the pH is?
If it's strongly acidic or alkaline phosphorous could be limited.
When you moved it was the light level actually the same or was it increased? Closer to lights? Getting some sunshine?
If it's strongly acidic or alkaline phosphorous could be limited.
When you moved it was the light level actually the same or was it increased? Closer to lights? Getting some sunshine?
SlipperFan
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It looks like a lot of light to me.
OrchidIsa
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pH of what? Water or substrate (only a few medium bark chunks)? Water pH is between 6 and 6.5.
In my office, no sunlight and it's a bit farther to lights than in my orchidarium. The leaves were more reddish back then, now greener. But even with that change of color, the spots are new for sure. It's not that I didn't see them before.
OrchidIsa
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How strong... I don't have any instrument to measure. 
The plant is about 12 inches below the T5HO fluos (one 6400K and on 2700K).
I'm pretty sure the spots weren't there before. I would have probably noticed something different on the leaves surface. Everything was uniform in color... I feel like it has less light than before.
The plant is about 12 inches below the T5HO fluos (one 6400K and on 2700K).I'm pretty sure the spots weren't there before. I would have probably noticed something different on the leaves surface. Everything was uniform in color... I feel like it has less light than before.
