The Reasons for the Death of a Cactus

Parasites

• Clemson University states that parasitical mites are among the major reasons that cacti fail to thrive. Spider mites, mealy bugs, scale insects and aphids are all parasites that prey on the cactus, causing discoloration and withering of the cactus’ flesh. Insecticidal soaps that are meant for cacti help combat these pests, but the results are best if the infestation is caught early on. If one cactus has mites, check the cacti around it for these invaders as well. Carefully examine each new cactus before you bring it home in order to prevent bringing parasites into your home.

Conditional Issues

• Though they are highly adapted to their desert environment, cacti can suffer under adverse conditions that are not what they are suited for. Different cacti have different tolerances for cold, but freezing damage can strike any cactus. Signs of freezing damage include yellowed and wrinkled flesh. Cacti can also become sunburned, especially if they are grown in greenhouses. Planting a cactus too shallowly also results in the cactus falling over, which can be fatal as well.

Overwatering

• Cacti are desert plants and thus do not need much water. Depending on the variety of cactus you have chosen, it may need water only once a week, or even less. When you water, saturate the cactus well, but do not allow the cactus’ pot to sit in water. Only water the cactus when the soil is completely dried out.

Disease

• Cacti are prone to several diseases, some of which are related to overwatering. Root rot, which occurs when the soil is too wet, can be fatal, as can crown rot. Fungal lesions and bacterial rots can also affect these plants. Watch your cacti for any discolorations or softening. If you notice soft spots or signs of fungus, quarantine the cactus. Depending on the extent of the infection, the specimen may need to be destroyed.