Why does your Copiapoa cinerea have white cottony spots? Diagnose the cause and fix it with our step-by-step guide.
The white, cottony masses are characteristic of mealybugs, which secrete a waxy substance to protect themselves while they suck sap from the cactus body. In Copiapoa cinerea, these pests often hide near the base or within any crevices in the ribbed structure.
Scale insects can appear as white, fuzzy patches on the epidermis of the cactus. They attach themselves to the plant to feed on nutrients, eventually causing localized swelling or scarring on the silken skin.
In high humidity, certain fungi can manifest as white, thread-like structures on the surface of the cactus. This often precedes significant rot if the moisture levels are too high for this desert-dwelling species.
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