Sempervivum forum→Diseases and pests of sempervivum

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Name: Lynn
Oregon City, OR (Zone 8b)
Charter ATP Member Garden Sages I helped plan and beta test the plant database. I helped beta test the Garden Planting Calendar I was one of the first 300 contributors to the plant database! Plant Database Moderator
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valleylynn
Mar 27, 2021 12:28 PM CST

Moderator

Please stay on topic in this thread. Only add information or photos of semps that have been affected by disease or pest.
Here is a link that Beatrix posted on FB. Have any of you here in the U.S. dealt with this?
https://www.facebook.com/group...
[Last edited by valleylynn - Mar 28, 2021 4:06 PM (+)]
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Virginia (Fairfax) (Zone 6/7) (Zone 7a)
Sempervivums Sedums Region: Virginia Garden Photography Container Gardener Bookworm
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sedumzz
Mar 27, 2021 5:05 PM CST
Can't click the link, when I copy the url it says i don't have permission to view
[Last edited by sedumzz - Mar 27, 2021 5:06 PM (+)]
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Name: Lynn
Oregon City, OR (Zone 8b)
Charter ATP Member Garden Sages I helped plan and beta test the plant database. I helped beta test the Garden Planting Calendar I was one of the first 300 contributors to the plant database! Plant Database Moderator
Forum moderator I helped beta test the first seed swap Million Pollinator Garden Challenge Celebrating Gardening: 2015 Plant and/or Seed Trader Garden Ideas: Master Level
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valleylynn
Mar 27, 2021 8:39 PM CST

Moderator

I'm sorry Alex. I guess you have to me a member of that FB group. I'll see what I can do.
Name: Sol Zimmerdahl
Portland, Oregon (Zone 8b)
Sempervivums Garden Art Container Gardener
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GeologicalForms
Mar 27, 2021 11:29 PM CST
Is this about the bizarre fungus semps get in Germany? I saw some photos of elongating, spotted and gnarled leaves on the sempervivum-liste.de that were a little disturbing, never seen anything like that in my backyard thankfully.
Name: Lynn
Oregon City, OR (Zone 8b)
Charter ATP Member Garden Sages I helped plan and beta test the plant database. I helped beta test the Garden Planting Calendar I was one of the first 300 contributors to the plant database! Plant Database Moderator
Forum moderator I helped beta test the first seed swap Million Pollinator Garden Challenge Celebrating Gardening: 2015 Plant and/or Seed Trader Garden Ideas: Master Level
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valleylynn
Mar 28, 2021 4:08 PM CST

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Alex, see if this link works for you. @sedumzz
https://www.facebook.com/group...

Yes Sol, we probably read the same post by Beatrix. Hopefully this new link will work. I think a person can see/read the post, but can't comment on it unless they are a member of the group.
[Last edited by valleylynn - Mar 28, 2021 4:46 PM (+)]
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Virginia (Fairfax) (Zone 6/7) (Zone 7a)
Sempervivums Sedums Region: Virginia Garden Photography Container Gardener Bookworm
Plant Lover: Loves 'em all! Houseplants Native Plants and Wildflowers Cactus and Succulents Tropicals Amaryllis
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sedumzz
Mar 29, 2021 5:05 PM CST
I have sent a request to join. Hopefully that works out
Virginia (Fairfax) (Zone 6/7) (Zone 7a)
Sempervivums Sedums Region: Virginia Garden Photography Container Gardener Bookworm
Plant Lover: Loves 'em all! Houseplants Native Plants and Wildflowers Cactus and Succulents Tropicals Amaryllis
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sedumzz
Mar 29, 2021 7:17 PM CST
Ok, now that I see what this is, I have done some research:

Bad news (sort of bad news, anyways):
1. This spreads by spores, but takes STAGES. spermogonia and aecia are the two stages. From
If you see this, discard the plant immediately!!!!!!!!! I think spermogonia is the budding/fruiting process and aecia is when it is growing.

2. This fungus mainly buds and fruits at autumn and winter.

3. It can affect/infect pretty much all of Crassulaceae so if it's infected, quarantine all nearby plants in a place SUPER away from any of your other succulent friends such as Echeveria or Crassula.

4. Too many plants to check??? This fungus mainly attacks: Sempervivum arachnoideum, calcareum, montanum, tectorum, wulfenii and rollers.

5. Apparently only leaves in early summer are affected. I don't know why though.

5. Mainly in Serbia and Romania and Italy. Or just mainly Europe right now.

6. This fungus WILL and CAN kill your Sempervivum.

7. According to researchgate.net, symptoms include "deformation or withering of the rosette, slightly protruding pustules (sori) covered with epidermal cells, and elongation of leaves". Basically:
- Withering rosettes, aka. rosettes dieing for no apparent reason
- Bumps that look like cones or just overall bumps.
- Weird elongated leaves that don't look natural (Aka. other plants in similar area don't have this problem)

8. This is a pathogen… yea…

9. It's spores are bright orangish or rusty red. Sometimes golden.

Good news:
Easy to detect - Weird cones? Bright colored mini-volcano looking things? Weird elongation?
Fungicide MAY work!
Is not a widespread pandemic YET.

Please keep an eye on the sempervivum!!!!! I dont want anyone to have a big infection!!!!1111!!1!!11

Websites:
https://bladmineerders.nl/para...
https://www.researchgate.net/p...

Im going to keep digging later when I have time

[Last edited by sedumzz - Mar 29, 2021 7:33 PM (+)]
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Name: Kevin Vaughn
Salem OR (Zone 8a)
JungleShadows
Mar 29, 2021 8:45 PM CST
Maybe just as well we have no semps coming from Europe right now. Something we don't want to bring over here. Seeds would be safe.

We can enjoy our closed borders for SOMETHING now.

Kevin
Name: Julia
Washington State (Zone 7a)
Photo Contest Winner 2018 Garden Photography Region: Pacific Northwest Celebrating Gardening: 2015 Forum moderator Plant Database Moderator
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springcolor
Mar 29, 2021 9:05 PM CST
I was thinking that same thing.
Sempervivum for Sale
Name: Lynn
Oregon City, OR (Zone 8b)
Charter ATP Member Garden Sages I helped plan and beta test the plant database. I helped beta test the Garden Planting Calendar I was one of the first 300 contributors to the plant database! Plant Database Moderator
Forum moderator I helped beta test the first seed swap Million Pollinator Garden Challenge Celebrating Gardening: 2015 Plant and/or Seed Trader Garden Ideas: Master Level
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valleylynn
Mar 29, 2021 9:55 PM CST

Moderator

Absolutely GREAT research Alex. Way to go. Hurray!
Name: Jo Ann
Washington State (Zone 7a)
Sempervivums
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ricos
Apr 1, 2021 12:37 AM CST
Yes Great Research. Thanks Alex.
I guess we are on our own now.. Just as well I hate to think of what WSDA would do if something like that got loose here.
Virginia (Fairfax) (Zone 6/7) (Zone 7a)
Sempervivums Sedums Region: Virginia Garden Photography Container Gardener Bookworm
Plant Lover: Loves 'em all! Houseplants Native Plants and Wildflowers Cactus and Succulents Tropicals Amaryllis
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sedumzz
Apr 1, 2021 12:20 PM CST
It would be disastrous if that got over here, this pathogen attacks pretty much all of crassulucae!
Romania, Mures (Zone 6b)
Sedums Sempervivums Region: Europe Roses
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PaleoTemp
Apr 1, 2021 1:12 PM CST
I was aware of the Serbian study for a while, because it mentioned Domogled, Romania, which is actually quite a touristic location. I am surprised it was not discussed here before.
Weather this fungus is all over Romania is questionable.
I could say some stuff I have received from Germany is highly questionable.
Name: Nathaniel
IN (Zone 6b)
ndmpkt13
Apr 12, 2021 10:17 PM CST
While looking online tonight, I found something interesting about our fungus. According to this abstract, a couple cases have been found in Ontario and some north eastern states. The worst part is this article is from 2016.

" Epiphytotic development of the rust fungus Endophyllum sempervivi was recorded in May 2016 in the cemetery of Borzova village (Volhynian Region, Ukraine) on Jovibarba globifera, a host species and genus new for Ukraine. In northern Europe (Belgium, Denmark, Ireland, Netherlands, Norway, Sweden, UK), USA (northeastern states) and Canada (Ontario) E. sempervivi occurs beyond the area of natural distribution of Sempervivum and Jovibarba; however, it is apparently absent in Morocco, Spain south of the Pyrenees, Italy south of the Alps and in west Asia (the Caucasus) despite the presence of indigenous species of Sempervivum. A list of all localities in which E. sempervivi was recorded in Ukraine is provided. The article is illustrated by micrographs obtained by scanning electron microscopy."
Virginia (Fairfax) (Zone 6/7) (Zone 7a)
Sempervivums Sedums Region: Virginia Garden Photography Container Gardener Bookworm
Plant Lover: Loves 'em all! Houseplants Native Plants and Wildflowers Cactus and Succulents Tropicals Amaryllis
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sedumzz
Apr 13, 2021 5:30 AM CST
Oh no. That is scary.
Name: Lynn
Oregon City, OR (Zone 8b)
Charter ATP Member Garden Sages I helped plan and beta test the plant database. I helped beta test the Garden Planting Calendar I was one of the first 300 contributors to the plant database! Plant Database Moderator
Forum moderator I helped beta test the first seed swap Million Pollinator Garden Challenge Celebrating Gardening: 2015 Plant and/or Seed Trader Garden Ideas: Master Level
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valleylynn
Apr 13, 2021 10:04 AM CST

Moderator

Thank you Nathaniel for the great information. It seems it may be more wide spread than I thought.

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