Why does your Mammillaria marksiana have white cottony spots? Diagnose the cause and fix it with our step-by-step guide.
Mealybugs are common pests for Mammillaria species that secrete a white, waxy, cotton-like substance to protect themselves. These insects suck the sap from the cactus body, often leading to stunted growth or spotting on the tubercles.
Similar to mealybugs, scale insects can form white, fuzzy accumulations on the surface of the cactus. They attach themselves to the epidermis and feed on nutrients, which can cause the Mammillaria marksiana to lose its characteristic plumpness.
If the environment is too humid or the soil stays damp, fungal spores can germinate on the surface of the cactus, appearing as white, thread-like cottony growth. This is often a precursor to more serious rot in Mammillaria species.
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