Blue green spots on dendrobium roots and now Phal?? (Mold???)
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  #1  
Old 11-15-2018, 11:56 AM
Nails Nails is offline
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Blue green spots on dendrobium roots and now Phal?? (Mold???) Female
Default Blue-ish spots on roots

Hello! This will be my first post on this forum. I hope Iím not repeating something thatís been answered elsewhere (I did try the search engine!)

Until recently Iíve only had phals, but in August I bought my first dendrobium and noticed there were blue-green spots on the aerial roots....although at the time I thought it must be some kind of paint or dye from the store.

On Sunday, I repotted my dendrobium and a Phal. I noticed that the blueish spots were also on the roots in medium and it seemed to me that those areas that had the spots were mushy, so I removed any affected roots. I sprayed the roots with hydrogen peroxide.....which I know is not ideal, but I havenít been able to find any fungicide in my area yet, and I thought it would be better than nothing.

The next day, my Phal had two of the same blueish spots. Iíve attached pictures of the spots on the Phal roots (dendrobium aerial roots look okay so far)

Does anyone know what this is and what I can do about it?
Attached Thumbnails
Blue green spots on dendrobium roots and now Phal?? (Mold???)-99680f34-5496-4ede-92ea-ca1691c963c2-jpg   Blue green spots on dendrobium roots and now Phal?? (Mold???)-b4f10e1d-43ca-4cc6-8924-08635ee750ea-jpg   Blue green spots on dendrobium roots and now Phal?? (Mold???)-541a9634-2123-4078-8e1b-fb33becaa1db-jpg  

Last edited by Nails; 11-15-2018 at 02:18 PM..
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  #2  
Old 11-15-2018, 06:19 PM
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Ray Ray is offline
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Blue green spots on dendrobium roots and now Phal?? (Mold???)
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Maybe I'm just not seeing what you're referring to, but those exposed roots look dead to me.
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  #3  
Old 11-15-2018, 07:59 PM
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Roberta Roberta is offline
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Blue green spots on dendrobium roots and now Phal?? (Mold???)
 

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Blue green spots on dendrobium roots and now Phal?? (Mold???) Female
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First of all, no peroxide... it will strip the little hairs off the ends of growing roots, and tend to kill the roots.

To figure out what roots are viable (maybe not ideal but still helping the plant) and which are dead, water well. The living roots will tend to turn green (even if they have bad spots on the spongy velamin that covers the actual root, they're still hydrating the plant. If it stays brown or black (especially if shriveled) you can cut it. But on a new plant with possibly a poor roots system, don't be in a hurry to cut - even a bad root is better than no root. Once you have some significant new roots, you can clean up the sketchy ones.
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Old 11-18-2018, 01:43 AM
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King_of_orchid_growing:) King_of_orchid_growing:) is offline
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There's nothing wrong with those roots. They're alive.

Also stop with the hydrogen peroxide. It is not necessary and it can be harmful to the plant.

Those "white spots" are natural, don't worry about those, it isn't fungus.

The "blue green patches" might be cyanobacteria. They're harmless.
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  #5  
Old 11-20-2018, 04:03 AM
SteveJackson SteveJackson is offline
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Blue green spots on dendrobium roots and now Phal?? (Mold???)
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Thanks for sharing.
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