Why does your Mammillaria gracilis have white cottony spots? Diagnose the cause and fix it with our step-by-step guide.
These small, soft-bodied insects produce a white, waxy secretion that looks exactly like cotton. They hide in the crevices between the tubercles of the Mammillaria gracilis to suck sap from the plant.
Similar to mealybugs, these pests create a white, fuzzy coating over the cactus body. They attach themselves to the plant and feed on the internal fluids, which can lead to stunted growth in your spider cactus.
If the white spots appear more like a fine web on the soil surface or base of the cactus, it may be fungal growth due to high humidity or poor drainage. This is common if the Mammillaria substrate remains damp for too long.
Your plant might also be experiencing one of these issues:
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