Why does your Astrophytum myriostigma have white cottony spots? Diagnose the cause and fix it with our step-by-step guide.
Small, white, waxy insects known as mealybugs hide in the crevices of the Astrophytum's ribs and secrete a cottony mass for protection. They suck the sap from the cactus, which can lead to swelling or rot if left unchecked.
Certain species of scale insects produce a white, fluffy, or cotton-like coating over their bodies to protect themselves from desiccation. This can cause the Bishop's Cap Cactus to develop stunted growth or yellowish patches.
Excessive humidity or moisture trapped in the crevices of the ribs can trigger the growth of white fungal mycelium. This often accompanies early stages of soft rot in the cactus tissue.
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