Ask a Question forum: louisiana iris fungus

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Washington st. (Zone 8b)
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lutatajoslyn
May 28, 2015 6:01 PM CST
The leafs on the louisiana irises have spots. I know it is a fungus, but my method of treatment was not very successful. What is the best way to fix it?


Name: Jean
Prairieville, LA (Zone 9a)
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Moonhowl
May 29, 2015 8:09 AM CST
OOps.
[Last edited by Moonhowl - May 29, 2015 8:11 AM (+)]
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Name: Jean
Prairieville, LA (Zone 9a)
Charter ATP Member Plant Identifier The WITWIT Badge Garden Sages Celebrating Gardening: 2015
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Moonhowl
May 29, 2015 8:10 AM CST
Welcome to ATP Welcome!

Here is some info for you. Hope this is helpful.

http://eveysblissfulgarden.com/Iris/troubleshooting/leafspot...

https://www.louisianairis.com/diseases.htm

http://www.zydecoirises.com/Culture/CultureZydeco.htm
Washington st. (Zone 8b)
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lutatajoslyn
May 29, 2015 9:14 PM CST
Thank you very much for information. I read it. I have attached the picture to the question, but I don’t see it. Something I did not get about uploading image. OK, I will figure it out. Only looking on the picture I found out what might be the cause of a fungus (I am not sure). What do you think, can the very old rotten fence be the trouble maker? The irises are growing right next to that fence. Over there are several other plants, such as phloxes and clematis, they don't look very good also.

Thumb of 2015-05-30/lutatajoslyn/e01b8f

Name: Jean
Prairieville, LA (Zone 9a)
Charter ATP Member Plant Identifier The WITWIT Badge Garden Sages Celebrating Gardening: 2015
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Moonhowl
May 31, 2015 8:13 AM CST
It is possible I suppose. If the fence is rotting, it may be that the ground in that area is just too wet for your plants. Although, Louisiana irises are used to a lot of moisture in their native habitat. I would suggest following the care/treatment info in the links. Cut any of the leaves showing spots back to just a couple inches, dispose of the trimmings in the trash and treat the plants with a good fungicide. How deep are the rhizomes planted? Also. how often do you fertilize and water?
Name: Elaine
South Sarasota, Florida (Zone 9b)
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dyzzypyxxy
May 31, 2015 8:28 AM CST
Louisiana Iris grow IN water for me here. No sign of a rusty fungus either, and we have every rust and fungus known to man floating around. So I'm thinking it's something to do with cool temperatures and a lot of rain maybe? I don't think the rotting fence itself could be the source of this, but maybe it is impeding the air flow around the plants?

I agree to cut off the affected leaves so the fungus will not spread. Be diligent about the housekeeping (no dead leaves left around etc.) , and treat with something anti-fungal. Once the weather warms up, and the leaves will dry between waterings that stuff will go away.

You should also see if you can make sure there is good space for air circulation around the plant, so the leaves will be able to dry and always water in the mornings, not at night!
Elaine

"Success is stumbling from failure to failure with no loss of enthusiasm." –Winston Churchill

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