Is this black fungi and how to treat it?

[KC Kam]

Greetings All,

I need some help here..i am not sure what is this..i highlighted it in the red box...it is spreading to all the roots. I applied some fungicides as well as hydrogen peroxide but i am unable to get rid of it.

I grow some of my orchids in leca...even some leca balls have them.

Can anyone advise on this?

Thanks

[estación seca]

This is algae or blue-green algae, cyanobacteria. It does not harm the plant.

[KC Kam]

Originally Posted by estación seca

This is algae or blue-green algae, cyanobacteria. It does not harm the plant.

Hi Estacion,

Oh...i didnt know those are algae, even those in my newly attached photo on my mounted dendrobium and oncidium were same algae?

[estación seca]

Yes. Very common in high humidity.

[KC Kam]

Originally Posted by estación seca

Yes. Very common in high humidity.

Hi Estacion,

Noted. Thanks for the advice. I thought it was some fungus and is sucking the life out of my plant. I tried so many ways to get rid of it but is so difficult to get rid of it. I even consider cutting all the affected roots and repot my orchid.

Thank you very much.