Black Spots on Euphorbia lactea

5 years ago

For some reason this summer has been crue to my Euphorbia and Crassula sp. I've had most of these plants for ten years or more. Two of the jades are over 25 years old. And for the first time, this summer I have had some problems. Powdery mildew on one of the jades and my Pachypodium. Sprayed them with Daconil at the end of last week. They Pachy looks good now and one of the jades looks good but might be showing some mildew again (hard to tell. My other jade looks ok but has dropped a bunch of leaves.

And then today I Just noticed this on my Euphorbia lactea. The plant looks fine everywhere else. Showed no signs of powdery mildew and seemed to be doing fine. Are these black spots anything to worry about? All of my plants (including this one) were sprayed with Daconil. All I could find in my google searching is that this sort of thing can appear when a Euphorbia is exposed to the cold for a period of time. But it's been a warm July here, so I don't think that's it. I'm guessing maybe the powdery mildew is a result of the overly humid weather we've had a lot of lately. I'm hoping that one more dose of Daconil about a week after the first dose will do the trick on the mildew. But these spots have me a little worried that there are other malevolent forces at work. Any suggestions or advice would be appreciated.

Featured Answer

Meyermike(Zone 6a Ma.)

5 years ago

Looks like burn marks or mechanical damage. Is it only in that area? On the side that gets the sun?

Watch to see if it progresses carefully. I think it will be fine. Seems you have some very nice clean growth)

Mike

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Comments (6)

KP Devlin
Original Author
5 years ago
One theory on the black spots... All plants were sprayed with Daconil out on the balcony. I left them to dry then brought them in. It's possible there were still some drops of it left on the plant. Could this possibly be from the sun hitting the plant and causing some burning? I sprayed them in a shady spot, but the window it's in is very sunny. Maybe I just put it back in the window too soon?
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Sebastian Ordenes
2 years ago
last modified: 2 years ago
Hey there! Did your euphorbia got better? and if so, were the spots still there after geting ok? Or was it a lost case?

I have an euphorbia right now with very similar black spots...!
KP Devlin
Original Author
2 years ago
I lost all those Euphorbia but saved the Pachypodium and all but one of the jades. I think I lost about 6 or 7 plants (including 5 Euphorbia) total. It sucked. But I took it as a valuable learning experience, and keep my succulents in a much drier environment now and they're thriving. Post a pic of your plant.
Sebastian Ordenes
2 years ago
last modified: 2 years ago
Oh lurd, that sounds terrible, I'm sure it sucked. But that's how it is I guess, trial and error.

I'm attaching two pics. And now thinking on looking up how to reduce humidity in the greenhouse without losing much heat.
KP Devlin
Original Author
2 years ago
Yes, I think the best thing you can do is provide a dry environment for them. if the air is too damp, the fungus could be an ongoing problem and will be a battle you'll lose eventually. Your plant doesn't look too bad. If it were me, I'd cut off any affected parts of your plants and get them to as dry and sunny spot as you can. Looks like you've got some beautiful plants in your collection!