Irises forum: Black mold?

Views: 236, Replies: 10 » Jump to the end
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
Aug 4, 2016 6:15 AM CST
When I was potting up some iris yesterday I noticed black spots along the top of all the iris I got in a recent order (not Superstition). It was the area just in front of the fan. Some of the larger rhizomes had a solid black band. I think it is mold. I washed bleach and water over them and sprinkled Comet on them. On ones with just spots the bleach seems to have removed all the mold but those with black bands still had some.

Should I dig these all up and dip them? One of the rhizomes is a iris that is hard to find so I want to not lose it. The spots are on every iris I got in the order. Never had this problem before.

Suggestions?
My road calls me, lures me west, east, south & north; most roads lead men homewards, my road leads me forth. - John Masefield
Name: Arlyn
Whiteside County, Illinois (Zone 5a)
Irises Beekeeper Region: Illinois Celebrating Gardening: 2015
crowrita1
Aug 4, 2016 6:28 AM CST
I think, if it was me, I'd just leave them be, if they are already in the ground. Maybe a squirt of fungicide might be in order, and, of course, keeping a close eye on them.
Name: Tom
Southern Wisconsin (Zone 5b)
Irises Vegetable Grower Butterflies Region: Wisconsin Keeps Horses Cat Lover
Dog Lover Keeper of Poultry Daylilies Celebrating Gardening: 2015
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tveguy3
Aug 4, 2016 6:47 AM CST
That's different. I think Arlyn is right, usually the black powdery stuff is a fungus. On corn sometimes you get what's called smut, and it's a black powdery growth. I've never seen it on an iris 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: 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
Aug 4, 2016 6:55 AM CST
I had some on the cut rhizome tissue I received earlier in July. I think it was from the drying. My garage is always steamy in the summer and I've never had or seen this happen with or without my fan running when I've shipped.

I dipped and wiped it mostly off and planted and they're all secure and growing fine. Hmmm
Gimme it and I'll grow it!
Name: Liz
Concord, MA (Zone 6a)
Lover of wildlife (Raccoon badge) Peonies Organic Gardener Lover of wildlife (Black bear badge) Butterflies Bulbs
Bee Lover Hummingbirder Daylilies Clematis Region: Northeast US Birds
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Dachsylady86
Aug 4, 2016 7:02 AM CST
I have it too!!! I'm just leaving it alone those because so far it isn't doing anything obvious to the rhizomes besides freaking me out. It isn't fuzzy or soft. I'm worried that if I scrape it off I might introduce the tissue to infection.
Name: Lyn Gerry
Watkins Glen, NY (Zone 6a)
Keeps Horses Vegetable Grower Organic Gardener Irises Permaculture Dog Lover
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LynNY
Aug 4, 2016 7:31 AM CST
Lestv said:When I was potting up some iris yesterday I noticed black spots along the top of all the iris I got in a recent order (not Superstition). It was the area just in front of the fan. Some of the larger rhizomes had a solid black band. I think it is mold. I washed bleach and water over them and sprinkled Comet on them. On ones with just spots the bleach seems to have removed all the mold but those with black bands still had some.

Should I dig these all up and dip them? One of the rhizomes is a iris that is hard to find so I want to not lose it. The spots are on every iris I got in the order. Never had this problem before.

Suggestions?

Leslie, are you able to post a picture of it. Sorry, I don't have anything useful to tell you, but I'd like to see what it looks like for educational purposes
South central PA (Zone 6a)
Irises Region: Pennsylvania
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DaveinPA
Aug 4, 2016 7:31 AM CST
I have had this stuff. Doesn't always "wash" off easily or sometimes not at all. I agree with Arlyn and others to generally leave it alone. Most of those with it had been a long time in shipping and probably were not completely dry. Of course if it were completely dry the fans would be all shriveled as would the rhizome. Some did not grow the following spring, but I don't attribute that to the mold, but to the late planting with less than 6 weeks to first killing freeze, so roots had less time to take hold. None of the rhizomes became mushy.
Name: Liz
Concord, MA (Zone 6a)
Lover of wildlife (Raccoon badge) Peonies Organic Gardener Lover of wildlife (Black bear badge) Butterflies Bulbs
Bee Lover Hummingbirder Daylilies Clematis Region: Northeast US Birds
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Dachsylady86
Aug 4, 2016 7:54 AM CST
This is what mine looks like. I don't know if it's the same thing you all are talking about. The tissue hasn't eroded, but the black stuff came up where the old tissue was pulled away when I ripped off a dried up fan.

Thumb of 2016-08-04/Dachsylady86/838705

Name: Lyn Gerry
Watkins Glen, NY (Zone 6a)
Keeps Horses Vegetable Grower Organic Gardener Irises Permaculture Dog Lover
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LynNY
Aug 4, 2016 7:58 AM CST
Thank You!
Dachsylady86 said:This is what mine looks like. I don't know if it's the same thing you all are talking about. The tissue hasn't eroded, but the black stuff came up where the old tissue was pulled away when I ripped off a dried up fan.

Thumb of 2016-08-04/Dachsylady86/838705



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
Aug 4, 2016 8:07 AM CST
You are quite right that the black stuff is dry. The spots wash off, the band doesn't. I will keep a watchful eye on them and go take a picture too. Thanks.
My road calls me, lures me west, east, south & north; most roads lead men homewards, my road leads me forth. - John Masefield
Name: Jen Jax
Northern Kentucky (Zone 6a)
Irises Peonies Region: Kentucky Dog Lover Enjoys or suffers cold winters
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Boxergirl
Aug 4, 2016 4:59 PM CST
I get that every year here on my new ones. Me think it's the humidity. I leave it alone and all is fine.

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