Cactus and Succulents forum→Please help identify these spots on my succulent

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May 9, 2020 7:49 PM CST
I recently received this succulent as a gift. There was a couple white scab like spots on a few leaves, these spread quickly. I am unsure what to do, I am very new to succulents in general. For now, I am keeping it quarantined from my other plants. Thank you for any advice in advance Smiling
Thumb of 2020-05-10/Mishi47/04cfce

Name: Paula Benyei
NYC suburbs (Zone 6b)
May 9, 2020 9:07 PM CST
That looks to me like weather damage... I don't know where your located, is it possible that it got a little sunburn? Or exposure to very cold temps?
I am almost certain it's not bugs.

With new plants it's hard to tell, there can be damage done before you get it that takes a couple days to show up as the dead cells callous over time. How long have you had it? Is it inside or out?
The plural of anecdote is not data.
Name: Bob
The Kau Desert, Hawaii (Zone 12a)
May 10, 2020 2:04 PM CST
I see a lot of this and it makes it difficult for me to grow Crassulas.
I have given up on some varieties of Crassula and occasionally I treat my Jade bushes to stop it.
I sent a sample away to the State Department of Agriculture to be analyzed.
They told me it is "Crassula Brown Spot Fungus"
This is a very generic title, not a specific family of fungus, so use any generic fungicide to stop it.
The spots will remain but the fungus will not spread once you have treated it.
They say that Neem oil has fungicidal properties.
I use an assortment of other fungicides that I can purchase form Ag chemical supply stores.
Name: Paula Benyei
NYC suburbs (Zone 6b)
May 10, 2020 4:22 PM CST
It's possible that it is a fungus if you live in the wettest hottest moistest places on the planet.

The best way to treat any fungus is Dry it out. Give the plant bright sun and withhold water,

If your crassula gets a fungus, any fungus, you have too much humidity or overwatering, Period.

The plural of anecdote is not data.
Name: Bob
The Kau Desert, Hawaii (Zone 12a)
May 10, 2020 7:23 PM CST
@turbosaurus My island (the big island) is not the wettest spot on earth but very close.
The island of Kauai is the wettest with 600-800 inches of rain per year.
Where I live is in the lee of the mountain and I get 7-27 inches of rain per year.
50 miles away on the other side of the mountain it gets 300-500 inches per year.
I do suffer from a humidity of 60% as my normal.
That is why I have trouble with fungus, especially on my orchids since we water them more often.
Name: Baja
Baja California (Zone 11b)
Cactus and Succulents Seed Starter Foliage Fan Xeriscape Container Gardener Hummingbirder
Native Plants and Wildflowers Garden Photography Region: Mexico Plant Identifier Forum moderator Plant Database Moderator
May 10, 2020 7:30 PM CST


This is interesting. Our average humidity is 80% and only that low due to seasonal wind reversals (esp. in the winter) where the humidity drops to 10% for a few days at a time. Here is our recent history, by way of example:

Thumb of 2020-05-11/Baja_Costero/60e521

I have very few fungal problems with my succulents, though. I guess that can be attributed to excellent air flow (near-constant ocean breeze) and strong light, despite the regular nighttime fogs.

When in doubt, I recommend good air flow and strong light as potential preventative measures for fungal issues.

None of this may save the plant in the original post, but perhaps there's some food for thought.
[Last edited by Baja_Costero - May 10, 2020 7:30 PM (+)]
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