- Black spots on two of my cactus. Does anyone know what causes this and what it actually is?
- 001.JPG (43.49 KiB) Viewed 1140 times
Help Please! What are these black spots from?
Help Please! What are these black spots from?
Can anyone tell me if this is actually a fungal problem or is there such a thing as fluid exudation on cactus plants? I have not watered these for a couple weeks and just got them used to the sun. These spots were not on there this morning but after sitting in the early afternoon sun they appeared. What is this and what can I do about it? I sprayed them with a copper fungicide just in case and moved them out of direct sun for now.
- Attachments
-
- 003.JPG (48.37 KiB) Viewed 1140 times
-
- 004.JPG (34.93 KiB) Viewed 1140 times
-
- 005.JPG (35.19 KiB) Viewed 1140 times
-
CoronaCactus
- Posts: 10421
- Joined: Thu May 24, 2007 6:16 pm
- Location: Corona, California USA [Zone 10]
- Contact:
Re: Help Please! What are these black spots from?
Looks like Thricocereus/Echinopsis spachiana, which is not known to leak fluids. Black furry balls would indicate flower buds, those aren't flower buds.
It almost looks like bird poop, but the pics a bit blurry.
It almost looks like bird poop, but the pics a bit blurry.
Re: Help Please! What are these black spots from?
could it have been stung by another cactus? I had something a bit similar on one of my trichos once
With apologies to the late Professor C. D. Darlington the following misquotation springs to
mind ‘cactus taxonomy is the pursuit of the impossible by the incompetent’ - Fearn & Pearcy, Rebutia (1981)
mind ‘cactus taxonomy is the pursuit of the impossible by the incompetent’ - Fearn & Pearcy, Rebutia (1981)
Re: Help Please! What are these black spots from?
It could have been. I have them all sitting very closely together. The two of them where right next to each other.
Re: Help Please! What are these black spots from?
No, not bird poop. They were kind of oozing. The area is hard not soft at all. I used a q tip and wiped it with copper fungicide and the some of the black rubbed off on the qtip but not mushy or soft at all.
Re: Help Please! What are these black spots from?
I hear you.
I have something like that on a few seedlings. No soft at all, blisters, some liquid leak but not much, spots eventually turns black. I still not sure of what's causing it. I have too many blisters to consider they would all sting each others. These seedlings are still under lights so, no chance of sunburn. My thread: http://www.cactiguide.com/forum/viewtop ... rs#p238263
There is also this thread... which looks a lot like it to me but a stage before the black spot. This one is very spreaded while mines have more small spots.
http://www.cactiguide.com/forum/viewtop ... rs#p238117
Can you find other spots that are not black or are they the only spots on the plants ? Would you consider these threads pictures ressemble your problem?
I have something like that on a few seedlings. No soft at all, blisters, some liquid leak but not much, spots eventually turns black. I still not sure of what's causing it. I have too many blisters to consider they would all sting each others. These seedlings are still under lights so, no chance of sunburn. My thread: http://www.cactiguide.com/forum/viewtop ... rs#p238263
There is also this thread... which looks a lot like it to me but a stage before the black spot. This one is very spreaded while mines have more small spots.
http://www.cactiguide.com/forum/viewtop ... rs#p238117
Can you find other spots that are not black or are they the only spots on the plants ? Would you consider these threads pictures ressemble your problem?