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Go Back   Orchid Board - Most Complete Orchid Forum on the web ! > ORCHID DISCUSSIONS > Pests & Diseases
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  #1 (permalink)  
Old 05-21-2008, 05:27 AM
ed241 ed241 is offline
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Default Roots getting white powery film

Help,
The roots of my orchids and the top layer of bark is turning white. I use R.O. water(the tds. meter says 008) I have not fertilized in a long time and I soaked and flushed the pots but it still comes back.
I remove the top layer of bark and the new bark starts turning white.
Also my semi-hydro pots are doing the same thing
thanks
Ed
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Old 05-21-2008, 12:45 PM
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King_of_orchid_growing:) King_of_orchid_growing:) is offline
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If you're suggesting you thought it might've been mineral and salt deposits, I'm not sure it is. Mineral and salt deposits are crusty, like when you get a T-shirt wet in salt water and you allow the salt water to dry on the shirt. If you have a pic that would help.

Sounds more like fungus.

If it is, then...More air circulation. Change out medium. Use a fungicide (you gotta ask someone who knows fungicides for this one, be careful). Reduce humidity. Water a bit less.

A pic would go a long way.
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Old 05-21-2008, 04:16 PM
ed241 ed241 is offline
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here ya go
Attached Thumbnails
roots-getting-white-powery-film-100_2571.jpg
roots-getting-white-powery-film-100_2572.jpg
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Old 05-22-2008, 04:30 AM
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King_of_orchid_growing:) King_of_orchid_growing:) is offline
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It's for sure fungal.
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Old 05-25-2008, 07:59 PM
ed241 ed241 is offline
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I treated with Physan 20 and it actualy seems to have gotten worse.
More of the rocks have turned white
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Old 05-31-2008, 05:44 PM
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How do you grow your plant? Where do you grow this?
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Old 05-31-2008, 09:17 PM
ed241 ed241 is offline
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I grow them in my house under a h.i.d. light. All are in semi -hydro except one which is in bark. I have been growing them for several years whith no problem.
I am watering them twice a week now hopping it will flush them out. I had been watering once a week.
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Old 06-01-2008, 12:30 AM
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Okay, I think I see a humidity tray underneath the pots.

I think you've got too much humidity and too little air circulation. That's a classic condition for growing fungus.

Do you have a fan lightly blowing air around the orchids?
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Old 06-01-2008, 12:31 AM
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I think the hydroponics medium adds to the moisture too. Perfect growing condition for fungus.

Like I said, try a fan.
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Old 06-01-2008, 12:36 AM
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try one off those litttle ten dollar computer tower fans and silicon it on the side of the tank just above the humidity tray
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