Physical trauma or fungal infection ?
This black spot appeared yesterday and has been spreading. The the whole cactus is also getting lighter in color towards the center
6” pot with drainage
Last watered 4 years ago
11
@NoeeAtNoon I might be wrong but this is what I think. Black spots on cactus plants are most commonly caused by chemical damage from fertilizers or soil additives that contain metals such as manganese, zinc, and iron. These chemicals burn through a plant's skin tissue causing black spot lesions.
@NoeeAtNoon I would try fertilizing it and see what happens. It may be in lack of nutrients. @RJG what do you think?
@NoeeAtNoon it could be due to this as well. I’m not a cactus person I’m relying on Google. Cacti turn black due to fungal diseases, including bacterial necrosis, crown rot, and phyllosticta pad spotting. To save your indoor plant at this point, you should remove the affected areas and try to prevent the spread of infection to the rest of your cactus as well as other nearby houseplants.
@NoeeAtNoon here is a link to look at. https://www.indoorplantsforbeginners.com/why-your-cactus-is-turning-black-what-you-can-do/
Hi so i came home and the black part had spread further, so i started cutting it but the flesh is actually white and nice, only the skin is black. What does that mean ?
