Irises forum: Why are my rhizomes rotting?!?!?!

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Name: Darcy
Reno, NV (Zone 6b)
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djinnevada
Oct 2, 2015 8:40 PM CST
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?
Name: Sherry Austin
Santa Cruz, CA (Zone 9a)
Region: California Irises Keeper of Poultry Roses Dragonflies Birds
Bulbs Foliage Fan Photo Contest Winner: 2015
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Henhouse
Oct 3, 2015 10:27 AM CST
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?
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Name: Arlyn
Whiteside County, Illinois (Zone 5a)
Irises Beekeeper Region: Illinois Celebrating Gardening: 2015
crowrita1
Oct 3, 2015 11:14 AM CST
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!
Name: Sherry Austin
Santa Cruz, CA (Zone 9a)
Region: California Irises Keeper of Poultry Roses Dragonflies Birds
Bulbs Foliage Fan Photo Contest Winner: 2015
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Henhouse
Oct 3, 2015 11:36 AM CST
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.
When counting, try not to mix chickens with blessings.
[Last edited by Henhouse - Oct 3, 2015 11:38 AM (+)]
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Name: Darcy
Reno, NV (Zone 6b)
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djinnevada
Oct 3, 2015 9:33 PM CST
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.
Name: Sherry Austin
Santa Cruz, CA (Zone 9a)
Region: California Irises Keeper of Poultry Roses Dragonflies Birds
Bulbs Foliage Fan Photo Contest Winner: 2015
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Henhouse
Oct 4, 2015 9:38 AM CST
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/r280100711.html
http://www.irises.org/About_Irises/Cultural%20Information/Pe...

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

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.
When counting, try not to mix chickens with blessings.
Name: Gabriel/Gabe Rivera
Charlotte, NC (Zone 7b)
German imported, Michigan raised
Region: North Carolina Hostas Enjoys or suffers hot summers Dog Lover Garden Procrastinator Daylilies
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Cuzz4short
Oct 12, 2015 7:59 PM CST
After Hurricane Joaquin blew by I had to toss a few small rhizome transplants
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Name: Leslie
Durham, NC (Zone 8a)
Region: North Carolina Irises Cat Lover Garden Photography Enjoys or suffers hot summers Celebrating Gardening: 2015
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Lestv
Oct 12, 2015 8:01 PM CST
Welcome! Being another Carolinian, I know how that goes!
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Name: Debra
Garland, TX (NE Dallas suburb) (Zone 8a)
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lovemyhouse
Oct 12, 2015 8:24 PM CST
Welcome!
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Name: Mary Ann
Kentucky
I was one of the first 300 contributors to the plant database! Region: United States of America Hostas Hummingbirder Daylilies Birds
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Muddymitts
Oct 12, 2015 9:19 PM CST
Hey Cuzz! Welcome to our little corner of ATP! Green Grin!
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iciris
Oct 12, 2015 10:03 PM CST
Welcome! From California.
Name: Richard
Joshua Tree (Zone 9a)
Birds Irises Ponds Orchids
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creativeclover
Oct 13, 2015 4:25 AM CST
Welcome Cuzz4short from California.
Name: Bonnie Sojourner
Harris Brake Lake, Arkansas (Zone 7a)
Magnolia zone
Region: United States of America Region: Arkansas Master Gardener: Arkansas Irises Bulbs Seed Starter
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grannysgarden
Oct 13, 2015 5:16 AM CST
Greetings Cuzz4short. Hope you did not lose too many plants in that weather event.
I love my garden.... and Jesus, and coffee, and naps.......
Name: Lucy
Hamilton, MA (Zone 6b)
irises
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irisarian
Oct 13, 2015 9:53 AM CST
Welcome! from New England
Name: John
Kansas City,MO (Zone 6a)
Region: Missouri Composter Enjoys or suffers cold winters Plays in the sandbox
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yadah_tyger
Oct 16, 2015 5:09 AM CST
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
Name: Bonnie Sojourner
Harris Brake Lake, Arkansas (Zone 7a)
Magnolia zone
Region: United States of America Region: Arkansas Master Gardener: Arkansas Irises Bulbs Seed Starter
Gardens in Buckets Garden Art Plant and/or Seed Trader Moon Gardener Garden Ideas: Master Level Celebrating Gardening: 2015
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grannysgarden
Oct 16, 2015 5:18 AM CST
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.
I love my garden.... and Jesus, and coffee, and naps.......
Name: Tom
Southern Wisconsin (Zone 5b)
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tveguy3
Oct 16, 2015 5:46 AM CST
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.
I am not afraid of an army of lions led by a sheep; I am afraid of an army of sheep led by a lion. - Alexander the Great
Name: Leslie
Durham, NC (Zone 8a)
Region: North Carolina Irises Cat Lover Garden Photography Enjoys or suffers hot summers Celebrating Gardening: 2015
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Lestv
Oct 16, 2015 1:40 PM CST
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.
My road calls me, lures me west, east, south & north; most roads lead men homewards, my road leads me forth. - John Masefield
Name: John
Kansas City,MO (Zone 6a)
Region: Missouri Composter Enjoys or suffers cold winters Plays in the sandbox
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yadah_tyger
Oct 16, 2015 2:19 PM CST
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
Name: Gabriel/Gabe Rivera
Charlotte, NC (Zone 7b)
German imported, Michigan raised
Region: North Carolina Hostas Enjoys or suffers hot summers Dog Lover Garden Procrastinator Daylilies
Plant and/or Seed Trader Irises Container Gardener Region: United States of America Garden Ideas: Level 1
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Cuzz4short
Oct 16, 2015 7:36 PM CST
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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