Black Spot on my Cactus
Hi Cactus Jungle,
May I ask, do you know why this cactus body is become black spot?
I just bought my plant last week. Yesterday I clean the brown patch (dead scale) from the cactus body.. However, the spot that I clean become black spot.. Today I tried to clean that again and scratch & wipe it using alcohol. However the wound is turn to black again.. Is it normal? Is it a disease and can it spread to next plant? Do I need to repot the plant?
Thank you very much for your help.
If there was scale there then the insect caused some damage on your cactus and it can take some time to heal. However, it sounds like you scratched it off and are still scratching at it. That is damaging the plant in itself. At this point you need to worry about rot and fungus, so I would recommend spraying with an organic neem oil.
In the future, spray the rubbing alcohol to kill the scale and let the remnant shell break down before cleaning it off with a soft paintbrush.