Why does your Ferocactus latispinus have white cottony spots? Diagnose the cause and fix it with our step-by-step guide.
These small, immobile insects secrete a white, waxy, cotton-like substance to protect themselves while they suck sap from the cactus body. In Ferocactus latispinus, these spots often appear in the crevices between ribs where moisture can linger.
Mealybugs are common pests for barrel cacti and produce distinct white, fluffy clusters that look like bits of cotton. They thrive in the humid microclimates found near the base or deep within the spine clusters of the plant.
If the white spots appear more like a fine mold rather than distinct clumps, it may be fungal growth triggered by high humidity or organic debris trapped in the cactus ribs. This is often accompanied by soft, decaying tissue on the plant epidermis.
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