Yellow orange spots on phalaenopsis leaves
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  #1  
Old 07-09-2018, 12:08 PM
chantrelle chantrelle is offline
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Yellow orange spots on phalaenopsis leaves Female
Default Yellow orange spots on phalaenopsis leaves

I have 3 hybrid phalaenopsis that have some yellow orange spots on their leaves.

It’s mainly on the leaves exposed to light (top leaves). I grow my phalaenopsis under T5 Fluorescents.

Here are some pictures

Phal II Spot by chantrell99, on Flickr

It is on the side of the leaf as it exposed to the light.
Phal
II side spot
by chantrell99, on Flickr

The plant its self looks rather in a good shape.
Phal II by cha
ntrell99
, on Flickr

Here it’s starting on another one

Phal I Spot by chantrell99, on Flickr

Would that be a virus, a fungus or due to the light ?
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  #2  
Old 07-09-2018, 12:40 PM
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Yellow orange spots on phalaenopsis leaves
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While I cannot say what the discoloration is, I can say that it is not wise to let water droplets stand on the leaves like that. You should water the potting medium, not the plant itself.
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  #3  
Old 07-09-2018, 12:55 PM
chantrelle chantrelle is offline
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Yellow orange spots on phalaenopsis leaves Female
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Quote:
Originally Posted by Ray View Post
While I cannot say what the discoloration is, I can say that it is not wise to let water droplets stand on the leaves like that. You should water the potting medium, not the plant itself.
Oh thank you ! I never knew if that was true or not. I will be now carefull with this.
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  #4  
Old 07-09-2018, 02:22 PM
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Water droplets are perfect incubation grounds for molds and bacteria...
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  #5  
Old 07-10-2018, 02:14 AM
Keithj Keithj is offline
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Water droplets can also act as lenses, focusing sunlight onto the leaf surface.

Keith
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Old 07-10-2018, 08:37 AM
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I've heard that, but it seems to me that if the focused light generated enough heat to cause any leaf damage, it would be sufficient to evaporate the water, making that self-correcting.
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