Green powdery mold/algae growth on Oncidium roots and leaves
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  #1  
Old 05-20-2021, 02:25 PM
shiba_ennui shiba_ennui is offline
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Green powdery mold/algae growth on Oncidium roots and leaves
Default Green powdery mold/algae growth on Oncidium roots and leaves

Hi! I just noticed some strange green growth on my Oncidium Aka Baby roots and leaves. It looks almost powdery and is green. It might be algae, but most pictures of algae on orchids Iíve seen are only on the roots and are darker in color. In addition, some of the roots look black ish but arenít squishy like in a case of root rot. Any ideas on what this is and if itís benign or not?
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  #2  
Old 05-20-2021, 02:55 PM
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Green powdery mold/algae growth on Oncidium roots and leaves Female
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It looks like algae to me. Quite harmless. What you see on the leaves might be encouraged by high humidity. What are your conditions? (Light, temperature, humidity)
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Old 05-20-2021, 03:04 PM
shiba_ennui shiba_ennui is offline
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Green powdery mold/algae growth on Oncidium roots and leaves
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I just got this plant 5 days ago. I grow them in an East facing window and supplement with an LED grow light hanging a few inches above. The temps are 75 degrees F during the day and drop to 65-68 at night. The humidity is 50-70%. Will the growth overtake my plant if I just leave it be?
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Old 05-20-2021, 03:14 PM
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Green powdery mold/algae growth on Oncidium roots and leaves Female
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I think just leave it be. Algae won't overtake the plant. Conditions sound good. These do like to stay on the damp side, so the sphagnum medium is probably fine as long as it is reasonably fresh (holding moisture but also admitting air). If it is very compacted a repot could be beneficial, but unless there is a serious issue it is best to wait for new growth before repotting.
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Old 05-21-2021, 03:00 PM
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Green powdery mold/algae growth on Oncidium roots and leaves
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I also think that is just algae. The newest bulb is looking healthy and plump so it's only the older bulbs that have algae on them. It probably just shows that the person who grew these was using an overhead sprinkler to water them.

I wouldn't worry about a few black spots on roots. In time it will grow new roots. It looks in good enough shape, I wouldn't worry about a few spots here or there, just observe them to make sure they don't spread.

Last edited by Shadeflower; 05-21-2021 at 03:04 PM..
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