If the stem starts to turn brown, this usually means it is rotting. … The most common cause of a brown, rotting stem in a cactus plant is root rot, and this is almost always because the plant is either over-watered, has poor drainage or both. Unfortunately, this might mean the end of your moon cactus.
Subsequently, how do I get rid of black spots on my cactus?
Use a sharp knife to cut out black spots under 2 inches in diameter on saguaros or other thick cacti. Remove a layer of healthy tissue 1/4- to 1/2-inch wide all the way around the wound and allow it to dry out on its own. If the wound is already exuding liquid or if it is low on the plant, it is too late to treat.
Simply so, how do I know if my moon cactus is dying?
How do you know if your moon cactus has been overwatered?
- Your rootstock is turning brown or becoming mushy.
- The soil is wet and soggy but you did not just water your cactus within the last 24 hours.
- You check the roots of the cactus and they are brown or black and mushy.
- The cactus does not have a well-draining soil.
How often should I water my moon cactus?
What does root rot look like?
The roots affected by root rot will look black and will feel mushy. Affected roots may literally fall off the plant when you touch them. Healthy roots may be black or pale, but they will feel firm and pliable.
Why does my cactus have dark spots?
A: Brown spots on cacti may be caused by a few different things including too much sun on newly planted cacti, damage from animals, frost, hail, some pesticides, and diseases. The spots on your cacti appear to be fungal lesions that sometimes occur when we have cool, wet weather as we did this winter.
How do you treat cactus dermatitis?
Cactus spine injuries to the skin are usually treated by removing the visible spines and applying a topical corticosteroid. With this approach, granulomatous inflammation usually resolves in 2 to 4 months.
What are the black spots on my prickly pear cactus?
These lesions are commonly seen on pads of prickly pear cacti (Opuntia species) and may be caused by several different pests or environmental conditions. … Lesions are almost completely black because of the presence of small black reproductive structures called pycnidia produced on the surface of infected plant tissue.
How do you get rid of mold on cactus?
How do you make homemade fungicide spray?
Mixing baking soda with water, about 4 teaspoons or 1 heaping tablespoon (20 mL) to 1 gallon (4 L.) of water (Note: many resources recommend using potassium bicarbonate as a substitute for baking soda.). Dishwashing soap, without degreaser or bleach, is a popular ingredient for homemade plant fungicide.