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Author Topic: Dactylorhiza disease  (Read 3346 times)


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Dactylorhiza disease
« on: June 09, 2007, 04:58:24 PM »
I have some orchids, dactylorhiza and orchis, in my garden. Unfortunately they have catched a very bad disease which I don't know how to cure. The main part of the infected plants die after the disease.
Is there anyone who knows this disease and how to cure it?
I have attached two pictures, so that you can see how it looks like.

Best regards,
Frederik Moeller,

Ian Y

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Re: Dactylorhiza disease
« Reply #1 on: June 09, 2007, 08:30:27 PM »
Hello Frederik
Many of us in th UK were affected by similar fungal diseases hitting our dactylorhizas a few years ago.
The good news is that it seems to have subsided now and our dactylorhiza plants are doing well again.
With our worst infected plpants I dug up the rhizomes and carefully removed the new young ones from the parent I disposed of the parent and kept the small young rhizomes which had not been infected.
I know some people planted the diseased plants in a far away corner of their garden and in time some of them recovered.
Ian Young, Aberdeen North East Scotland   - 
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Maggi Young

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Re: Dactylorhiza disease
« Reply #2 on: June 09, 2007, 10:05:48 PM »
The problem is caused by a fungal pathogen: Cladosporium orchidis. there is an article about this in "The Rock Garden" Journal number 107, June 2001.  The article by Brian and Maureen Wilson is on pages 168-170.

 Edited to add article in pdf: click to download....
 * Wilson Dact._diseasearticle.pdf (256.11 kB - downloaded 378 times.)
« Last Edit: May 26, 2010, 04:05:49 PM by Maggi Young »
Margaret Young in Aberdeen, North East Scotland Zone 7 -ish!

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Maureen Wilson

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Re: Dactylorhiza disease
« Reply #3 on: June 10, 2007, 07:45:20 PM »
I agree with the diagnosis.  In my experience fungicides have little effect.  The only help I know is to replant into clean soil and keep the rain off the plants with a clear plastic sheet while keeping them well ventilated.

Brian Wilson Aberdeen
Linlithgow, W. Lothian in Central Scotland


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Re: Dactylorhiza disease
« Reply #4 on: June 11, 2007, 10:33:47 AM »
Hello Ian Y, Maggi Young and Brian Wilson
Thank you for your help


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