Why does your Ariocarpus trigonus minor have white cottony spots? Diagnose the cause and fix it with our step-by-step guide.
The white cottony spots are likely the protective waxy secretions of mealybugs, which congregate in the crevices and near the areoles of Ariocarpus trigonus. These pests suck the sap from the cactus body, eventually leading to shriveling and potential rot.
Similar to mealybugs, scale insects can produce a white, fluffy appearance on the surface of slow-growing cacti like Ariocarpus. They attach themselves to the epidermis to feed on plant fluids, often leaving behind honeydew residue.
In high-humidity environments, certain fungal pathogens can manifest as white, thread-like mycelium spreading across the plant tissue. This is often accompanied by softening of the cactus flesh.
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