iris's disapearing

RyykkAugust 20, 2012

I noticed that some of my iris's were browning and suddenly they seemed to just disappear. When I dug into the garden I found many empty husks of rhizomes. Additionally they few that were left were orange on the inside instead of white and smelled of sulfur and decay. There seemed to be a number of parallel holes in the rhizomes but I thought this could be where roots had previously emerged from the rhizome.

I have been growing iris in this spot for 20 years without any difficulty. I cut off the bad sections and washed them off. Interesting fact was that some of the decaying rhizomes were sending up new green shoots.

Is this insect damage or is this a microbiological infection? What is the best way to treat it and the surrounding soil? I have an oxygen based food safe bleach that is used in the beverage industry to sterilize containers, will this work?

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hosenemesis(SoCal Sunset 19 USDA 8b)

That sounds like bacterial rot. I just scrape up the soil and throw it away. Sometimes you can cut off the affected part of the rhizome and let it dry out and replant. I cut until there is no more brown coloration. A lot of people claim that a short soak in a 10% bleach-water solution is a good practice.

Most plant the rhizomes in a new spot, and give the soil a rest from irises.

I believe the bacteria thrives in moist and humid conditions.


    Bookmark   August 21, 2012 at 12:35AM
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i treat bacterial rot with dawn dishwashing soap and a gardenhose sprayer

    Bookmark   September 17, 2012 at 3:10PM
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