and Saguaro in the wild as well as cacti in landscaping, gardens & kept as houseplants ? And here’s why root rots are common in cacti plants: Cacti have a wide, shallow root system to maximize water collection in their natural habitat. Cacti really don’t like to be watered very often, of course this depends on the specific cactus you have but in general these are pretty drought resistant plants. You may be able to save the plant if you catch the disease early. What genera/species of mold commonly grow on or injure cactus plants (family Cactaceae) such as the Mexican Nopal or prickly pear cactus (photo at left, - Opuntia Mill. ) This may sound abnormal because most of us tend to think that cacti plants are sun-loving, desert plants. Why is my cactus turning brown? Rinse the roots to remove the fungus and trim rotten areas. If the cactus is turning yellow or brown, it is getting too much sunlight and you should move it into a spot with better shade. Corking happens naturally when a cactus matures. Photographs of mold growth on the Nopal cactus, Opuntia Mill. Turning brown means that it has developed a disease called root rot, which is caused by poor drainage or excessive watering. All the information, content and live chat provided on the site is intended to be for informational purposes only, and not a substitute for professional or medical advice. The disease, which causes the plants to wilt and eventually die, is identified by a wilted appearance and soggy, black or reddish brown roots. Corking gives the plant a woody appearance. Another common cause of a cactus turning black can be attributed root rot which can be caused by overwatering, poor draining soil or a combination of both. If the soil is not dry, move the pot to an area where the cactus can get more sun. Check the plant for any signs of the roots rotting. Cactus turning black Huge pimple turned black Download Here Free HealthCareMagic App to Ask a Doctor. However, not all cacti species thrive in the hot sun. Attached Files: GEDC0747.jpg File size: 104.7 KB Black Spots on Cactus. Discoloration, shakiness, and mushy roots are often signs of cactus root rot. It occurs from the base of the plant where it touches the soil and can move up slowly or can stay in one spot. Remove the cactus from its pot. Other symptoms may include your cactus turning brown or black. Remove the cactus from its pot then begin inspecting the roots. It does not seem to be really soft and mushy. What are the causes, cures, & preventive methods for cactus … Thanks. Rot is caused by the skin of the cactus getting punctured some how, some ways are: An insect or animal biting the plant Debris in a monsoon storm hitting the plant Someone purposely poking the plant Another plant growing into the plant Cut away any brown or black parts of the cactus to prevent rot from spreading. Rot is a dark brownish-black spot that will start to ooze. 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