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Author Topic: iris leaf spot  (Read 1214 times)

John85

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iris leaf spot
« on: May 16, 2019, 12:37:38 PM »
Is there an organic way to control it? Copper sulfate is"allowed" but I am reluctant to use it because it kills a lot of good bugs in the soil.
Very old cvs are less prone to the disease.Can you recommend some resistant cultivars?

Maggi Young

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Re: iris leaf spot
« Reply #1 on: May 16, 2019, 12:43:40 PM »
Is  leaf-spot  mostly a  problem on bearded iris / those with  rhizomes ?    We  don't  grow  any  of those - and leaf-spot  does  not  seem to be  a problem here, thank goodness. Perhaps  our  weather  is  seldom humid  enough to  encourage its  growth ?
« Last Edit: May 16, 2019, 12:46:36 PM by Maggi Young »
Margaret Young in Aberdeen, North East Scotland Zone 7 -ish!

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John85

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Re: iris leaf spot
« Reply #2 on: May 18, 2019, 10:33:30 AM »
You must be jocking Maggi!Not humid enough in Scotland!Ok the East coast is much drier than the West but even so!
It is mainly a problem with iris germanica hydrids and with the new cultivars even more
Not all iris with a rhizome have that problem

 


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