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Oct 2, 2015 8:40 PM CST
Thread OP
Name: Darcy
Reno, NV (Zone 6b)
GAAAAHHHHH! After one day of rain, I went out to check my iris and several are mushy and starting to rot on top. I could understand if the rot was on the bottom or where the rhizome touched the ground, but why on top? What causes this and what do I do about it?
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Oct 3, 2015 10:27 AM CST
Name: Sherry Austin
Santa Cruz, CA (Zone 9a)
Birds Bulbs Region: California Dragonflies Foliage Fan Irises
Keeper of Poultry Roses Photo Contest Winner: 2015
I noticed that most of the rot started on the tops of my Iris as well. I would guess that it's where the spores find easy entry. Were these new Iris, or an established bed?
The surest sign that intelligent life exists elsewhere in the universe is that it has never tried to contact us.
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Oct 3, 2015 11:14 AM CST
Name: Arlyn
Whiteside County, Illinois (Zone 5a)
Beekeeper Region: Illinois Irises Celebrating Gardening: 2015
I think that rain, dew, .....whatever....collects in the "leaf folds", where they attach to the rhizome, and that's where the "top" rot starts. Shrug!
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Oct 3, 2015 11:36 AM CST
Name: Sherry Austin
Santa Cruz, CA (Zone 9a)
Birds Bulbs Region: California Dragonflies Foliage Fan Irises
Keeper of Poultry Roses Photo Contest Winner: 2015
I would think that's often the case too. Although I was thinking that it could possibly be due to an injury to the rhizome as well. Some of the rot I cleaned off this year was not around the base of the fan, but on old leaf scars further down. That was identified as probably Mustard Seed fungus and may present itself differently than the more common crown rot. I haven't had as much experience with rot as some of you, so I'll leave it to those who know more.
The surest sign that intelligent life exists elsewhere in the universe is that it has never tried to contact us.
Last edited by Henhouse Oct 3, 2015 11:38 AM Icon for preview
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Oct 3, 2015 9:33 PM CST
Thread OP
Name: Darcy
Reno, NV (Zone 6b)
My rot was further down on the rhizome too. I didn't see any damage to the rhizomes, just all of a sudden noticed they were getting mushy. I didn't notice a smell, either. My friend suggested cutting out/off the mushy parts then soaking them for 30 minutes in a 10 percent bleach solution, so I did that. Then set them out to let the cuts scab over and wouldn't you know, the rain started again. Sheesh! Do you need to do something special for Mustard Seed Fungus? These were in a new raised bed that I used all Kellogg's raised bed mix in. There wasn't any moisture against the rhizome.
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Oct 4, 2015 9:38 AM CST
Name: Sherry Austin
Santa Cruz, CA (Zone 9a)
Birds Bulbs Region: California Dragonflies Foliage Fan Irises
Keeper of Poultry Roses Photo Contest Winner: 2015
I don't know much about mustard seed fungus, except that you'll find kind of a cottony substance in the folds of the leaves, followed by spherical fruiting body that resembles mustard seed.
http://www.ipm.ucdavis.edu/PMG...
http://www.irises.org/About_Ir...

There's a good picture of the fruiting structure and white moldy growth on a peanut stem.
http://ipm.ncsu.edu/peanuts/di...

I was told to scrape out the soft part until you get to healthy tissue, then soak in a ten percent bleach solution. Swish it around so that you get in the leaves, and I pulled the leaves apart a bit to make sure the bleach solution got in there. Then dry for a day or two before replanting. It was recommended that I replace the soil where it was growing as well. I'd say that's pretty much the advice for other fungal rots as well.
The surest sign that intelligent life exists elsewhere in the universe is that it has never tried to contact us.
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Oct 12, 2015 7:59 PM CST
Name: Gabriel/Gabe Rivera
Charlotte, NC (Zone 7b)
German imported, Michigan raised
Garden Photography Plant and/or Seed Trader Enjoys or suffers hot summers Roses Garden Procrastinator Region: North Carolina
Lilies Irises Hybridizer Hostas Dog Lover Daylilies
After Hurricane Joaquin blew by I had to toss a few small rhizome transplants
Gimme it and I'll grow it!
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Oct 12, 2015 8:01 PM CST
Name: Leslie
Durham, NC (Zone 8a)
Garden Photography Cat Lover Irises Region: North Carolina Peonies Enjoys or suffers hot summers
Celebrating Gardening: 2015
Welcome! Being another Carolinian, I know how that goes!
"The chimera is a one time happenstance event where the plant has a senior moment and forgets what it is doing." - Paul Black
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Oct 12, 2015 8:24 PM CST
Name: Debra
Garland, TX (NE Dallas suburb) (Zone 8a)
Rescue dogs: Angels with paws needi
Dragonflies Dog Lover Bookworm I was one of the first 300 contributors to the plant database! Garden Photography Bee Lover
Plays in the sandbox Butterflies Region: Texas Garden Sages I sent a postcard to Randy! Charter ATP Member
Welcome!
It’s okay to not know all the answers.
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Oct 12, 2015 9:19 PM CST
Name: Mary Ann
Western Kentucky (Zone 7a)
Bee Lover Irises Hummingbirder Hostas Keeps Horses Farmer
Daylilies I was one of the first 300 contributors to the plant database! Container Gardener Cat Lover Region: Kentucky Birds
Hey Cuzz! Welcome to our little corner of ATP! Green Grin!
Thoughts become things -- choose the good ones. (www.tut.com)
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Oct 12, 2015 10:03 PM CST
Name: Barbara
Northern CA (Zone 9a)
Region: California Cat Lover Dog Lover Irises Enjoys or suffers hot summers
Welcome! From California.
• “Whoever said, ‘Do something right and you won’t have to do it again’ never weeded a garden.” – Anonymous
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Oct 13, 2015 4:25 AM CST
Name: Richard
Joshua Tree (Zone 9a)
Birds Herbs Irises Ponds Plant and/or Seed Trader
Welcome Cuzz4short from California.
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Oct 13, 2015 5:16 AM CST
Name: Bonnie Sojourner
Harris Brake Lake, Arkansas (Zone 7a)
Magnolia zone
Region: United States of America Region: Arkansas Master Gardener: Arkansas Irises Plant and/or Seed Trader Moon Gardener
Garden Ideas: Master Level Dragonflies Bulbs Garden Art Celebrating Gardening: 2015 Gardens in Buckets
Greetings Cuzz4short. Hope you did not lose too many plants in that weather event.
Thro' all the tumult and the strife I hear the music ringing; It finds an echo in my soul— How can I keep from singing?
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Oct 13, 2015 9:53 AM CST
Name: Lucy
Tri Cities, WA (Zone 6b)
irises
Charter ATP Member Cottage Gardener Irises Region: Northeast US Region: United Kingdom Region: United States of America
Enjoys or suffers cold winters
Welcome! from New England
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Oct 16, 2015 5:09 AM CST
Name: John
Kansas City,MO (Zone 6a)
Composter Region: Missouri Plays in the sandbox Enjoys or suffers cold winters
Yup. I planted a new bed with Schreiners "Armload" collection in late August. About 5 days later we had a pretty hard rain. Another 4 days and another rain. Lost about 20% due to rot! The center fan falls over and leaves the trademark "mush". Thank you Schreiners for your replacement policy. What I finally ended up doing is cutting most of the rhizome away from the small increases and carefully dug out the main rhizome. The small fans seem to be doing OK, we'll see if they survive the winter.
When they call the roll in the Senate, the Senators do not know whether to answer 'Present' or 'Not guilty.' Theodore Roosevelt
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Oct 16, 2015 5:18 AM CST
Name: Bonnie Sojourner
Harris Brake Lake, Arkansas (Zone 7a)
Magnolia zone
Region: United States of America Region: Arkansas Master Gardener: Arkansas Irises Plant and/or Seed Trader Moon Gardener
Garden Ideas: Master Level Dragonflies Bulbs Garden Art Celebrating Gardening: 2015 Gardens in Buckets
Greetings John, and welcome to the iris forum!! It sounds like you may have saved a lot of your irises with early treatment. I have lost only a few this summer, probably due to lack of rain. I hope I make it through the winter without any rot and enough moisture to inspire spring bloom.
Thro' all the tumult and the strife I hear the music ringing; It finds an echo in my soul— How can I keep from singing?
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Oct 16, 2015 5:46 AM CST
Name: Tom
Southern Wisconsin (Zone 5b)
Butterflies Vegetable Grower Keeper of Poultry Irises Keeps Horses Dog Lover
Daylilies Cat Lover Region: Wisconsin Celebrating Gardening: 2015
I don't remember ever having rot on a newly planted iris, only those who made it through the winter, and then got rot. I've had a few that just didn't take root and die though.
Politicians are like diapers, they need to be changed often, and for the same reason.
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Oct 16, 2015 1:40 PM CST
Name: Leslie
Durham, NC (Zone 8a)
Garden Photography Cat Lover Irises Region: North Carolina Peonies Enjoys or suffers hot summers
Celebrating Gardening: 2015
This year Grace Upon Grace turned to total mush within 5 days of planting. Boy that made me sad. And Kid Clothes did the same thing, only it had been planted about 2 months. I think it is the very wet summer that is doing mine in.
"The chimera is a one time happenstance event where the plant has a senior moment and forgets what it is doing." - Paul Black
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Oct 16, 2015 2:19 PM CST
Name: John
Kansas City,MO (Zone 6a)
Composter Region: Missouri Plays in the sandbox Enjoys or suffers cold winters
Yup, in about 5 days. Lost an entire row.

Mind telling me where you got Kids Clothes?
When they call the roll in the Senate, the Senators do not know whether to answer 'Present' or 'Not guilty.' Theodore Roosevelt
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Oct 16, 2015 7:36 PM CST
Name: Gabriel/Gabe Rivera
Charlotte, NC (Zone 7b)
German imported, Michigan raised
Garden Photography Plant and/or Seed Trader Enjoys or suffers hot summers Roses Garden Procrastinator Region: North Carolina
Lilies Irises Hybridizer Hostas Dog Lover Daylilies
Out of the several I had planted I only lost 5 or 6 small transplants during the hurricane system. It was heartbreaking honestly. All plant lives matter, especially the smaller ones Sighing!
Gimme it and I'll grow it!

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