How to Repair Cactus Root Rot

Cactus root rot is a fungal disease that often occurs when plants have root damage when planted, have been overwatered or grow in poorly draining soil. Symptoms consist of yellowing and softening of stems. Though difficult to judge, the inside of the cactus will begin to rot. If left untreated, your entire cactus could rot and eventually die out. It is important to monitor the cactus even after repairing the root to ensure that it doesn't succumb to the fungal disease.

Shovel

Knife

Alcohol

Sulfur powder

Collar

2 Stakes

Heavy gloves

Press a shovel 1 to 2 feet away from the cactus and at a depth of 12 to 18 inches to lift the plant up from underneath and expose its entire root system. For cacti that are taller than 6 feet, dig 3 to 4 feet away from the cactus to prevent harming its root system.

Dip a knife into alcohol and cut out the diseased portion of the plant. If the disease is located on the roots, remove discolored mushy roots. If the root rot has traveled up the cactus, remove the rotted area as well as some of the surrounding area. For example, when a 6-foot-high cactus has root rot extending up 2 cm of the plant, remove 4 cm.

Apply sulfur powder to the bottom of the cactus to prevent the disease from spreading. Place the cactus in a shady location to allow it to dry out for 1 week.

Dig a hole in the new planting area that is twice the size of the root ball and at the same depth as the cactus was planted in its original location. Make sure the bottom of the hole is level.

Place the cactus inside the hole in the same direction that it was oriented to the sun in its former location. Pack soil around the plant. Allow the cactus to dry out for 2 to 3 days before watering.

Create a collar for cacti that are over 5 feet that doesn't pierce the skin of the cactus. Secure the collar to two stakes placed on either side of the cactus for support. Keep the cactus staked for 3 months in thick soil or 6 months in thin soil.

Wear thick gloves whenever handling a cactus.