Why does your Ferocactus gracilis have white cottony spots? Diagnose the cause and fix it with our step-by-step guide.
These small insects attach to the epidermis of the Ferocactus, secreting a white, waxy, cotton-like substance to protect themselves. They suck sap from the cactus, which can lead to localized swelling or deflations in the barrel structure.
Mealybugs are highly common in succulents and appear as white, fuzzy clusters, often found in the crevices between the cactus ribs. They weaken the plant by draining nutrients and can excrete honeydew that leads to secondary black sooty mold.
While less common on desert cacti than on leafy plants, high humidity can trigger fungal growth that appears as a white dust on the surface. This fungus thrives when air circulation is poor around the barrel ribs.
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