Red spots with halo on oncidium twinkle.
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Red spots with halo on oncidium twinkle.
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  #1  
Old 12-31-2019, 05:19 PM
BrassavolaStars BrassavolaStars is offline
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Red spots with halo on oncidium twinkle. Male
Default Red spots with halo on oncidium twinkle.

Hello all,

While I was spraying my plants for mites, I noticed that this oncidium has some disturbing spots on it.

I know thatís itís normal for oncidiums to have spots but these donít look typical.

The spots are mostly pale on the top of the leafs but have red dots on the underside of the spots. Is this a fungus? It reminds me of the photos Iíve seen of cercospora. Should I treat it with clearyís? Hopefully itís not viral.
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  #2  
Old 12-31-2019, 05:36 PM
philiplowrey philiplowrey is offline
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Red spots with halo on oncidium twinkle.
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looks fungal to me
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  #3  
Old 12-31-2019, 05:40 PM
BrassavolaStars BrassavolaStars is offline
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Red spots with halo on oncidium twinkle. Male
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Quote:
Originally Posted by philiplowrey View Post
looks fungal to me
Thatís what it looks like to me also.
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  #4  
Old 12-31-2019, 06:43 PM
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SouthPark SouthPark is online now
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Red spots with halo on oncidium twinkle. Male
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Quote:
Originally Posted by BrassavolaStars View Post
Is this a fungus?
It could be. Where is this plant grown? Is it supplied with good air circulation at pretty much all times?

Just as a precaution, you could try clearys 3336/thiomyl or mancozeb. Isolate the plant too - just in case.

Avoid having the plant in still air environments - especially in a bathroom-restroom combination.


Last edited by SouthPark; 12-31-2019 at 06:46 PM..
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Old 12-31-2019, 07:14 PM
BrassavolaStars BrassavolaStars is offline
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Red spots with halo on oncidium twinkle. Male
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Hi all,

The plant was hung near the roof of my greenhouse. It was also under the roof vent. It is one of the plants that is further away from the fan. Since itís right under the roof vent (which is closed), I thought it would be okay to be a bit further from the fan. That part of the greenhouse is also around 72f/22c.

While Iím not sure that the circulation in the greenhouse is ideal, there is always a 5000w shop heater fan running 24/7.

I am wondering if it could be an issue with dripping water since it was right under the roof vent and itís been rainy lately? That being said, Iíve never seen the vents leak.

I brought it into a bathroom for quarantine and better light for a picture. It seems like that may be a bad place for it though.

I will definitely drench it in the fungicide though as it seems to most likely be a fungus. As much as I donít like fungi, they are still preferable to viruses.
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