Algae over leaves

[Guarceñosis]

I suffer a lot of this yellow algae over orchids leaves surface. Does any one has experience how to control it or erradicate it? Thanks.

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[abax]

I know it's a boring job and takes time, but using a diluted insecticidal soap as
a wipe works well and discourages the return of the algae.

 

[ehanes7612]

algae on leaves is caused by excessive humidity or leaves not drying out fast enough mixed with too much shade...I live in the Northwest US , we all know too much about this, algae grows everywhere in the wintertime...more circulation of air could help ...more light ..anything so that it dries out faster

 

[Ozpaph]

ive never seen that before.

 

[TyroneGenade]

Spray with dilute bleach (10 ml/l) or hydrogen peroxide (3%). If you don't fix the humidity issues then the algae will grow back.

 

[ehanes7612]

ive never seen that before.

that's because the sun always shines in Brisbane , right?

 

[CarlG]

Perhaps a quarternary ammonium compound (like Physan) would work better - that is more likely to disrupt the algae cells, while having less effect on the orchid leaves' cuticle.

The Physan bottle claims that it is non-phytotoxic, which seems counter to claims of being an algicide, however.

From a google search for physan:
"Physan20 is a broad range disinfectant, fungicide, virucide, and algaecide which effectively controls a wide variety of pathogens on hard surfaces and plants"

Of course, I've seen marble being called organic, so go figure...

 

[Ozpaph]

that's because the sun always shines in Brisbane , right?

It light at 0445 at the moment!

 

[Guarceñosis]

Thanks to all. I live in the tropic at 7200 ft asl. In rainy season the humididy can reach 96%, which can't control.

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[Guarceñosis]

Perhaps a quarternary ammonium compound (like Physan) would work better - that is more likely to disrupt the algae cells, while having less effect on the orchid leaves' cuticle.

The Physan bottle claims that it is non-phytotoxic, which seems counter to claims of being an algicide, however.

From a google search for physan:
"Physan20 is a broad range disinfectant, fungicide, virucide, and algaecide which effectively controls a wide variety of pathogens on hard surfaces and plants"

Of course, I've seen marble being called organic, so go figure...

Any idea of the dosage? Tks.

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[CarlG]

I'd start with perhaps 1cc per liter.

 

[Guarceñosis]

I'd start with perhaps 1cc per liter.

Thanks a lot

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