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?

OOps.

Welcome to ATP

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

http://eveysblissfulgarden.com...

https://www.louisianairis.com/...

http://www.zydecoirises.com/Cu...

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.

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?

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?

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!