Faucaria boschiana White Cottony Spots - Causes & Fixes

Jump to cause: Mealybugs Powdery Mildew Cottony Blight (Botrytis)

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Mealybugs

Mealybugs are small, soft-bodied insects that secrete a white, waxy, cottony substance to protect themselves. In Faucaria, they often hide in the crevices between the fleshy leaves or near the base of the plant.

Very Common

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How to confirm: Use a magnifying glass to check if the white spots move or are attached to the leaf axils.

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1 Isolate the plant immediately to prevent the spread of mealybugs to other succulents in your collection.

2 Treat the infestation by spraying the plant with an organic insecticide to eliminate the insects and their waxy coating.

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3 Use a cotton swab dipped in isopropyl alcohol to manually remove visible white cottony clusters from the crevices of the leaves.

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Powdery Mildew

This fungal disease manifests as white, flour-like patches on the surface of the leaves. While less common in succulents like Faucaria than in foliage plants, high humidity and poor airflow can trigger outbreaks.

Common

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How to confirm: Check if the white spots can be rubbed off easily with your finger and if new growth looks stunted.

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1 Apply an organic fungicide to eliminate the fungal spores and prevent the spread of the white patches.

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2 Improve air circulation around the plant and reduce humidity levels to create an environment less hospitable to powdery mildew.

3 Gently prune and dispose of any heavily infected leaves to prevent the fungus from spreading to healthy tissue.

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Cottony Blight (Botrytis)

This fungus thrives in damp, stagnant conditions around the base of the succulent. It produces a greyish-white fuzzy growth that can eventually lead to the rot of the plant's fleshy leaves.

Common

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How to confirm: Inspect the base of the plant for any signs of soft, mushy tissue accompanied by the white fuzz.

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1 Remove all affected leaves and debris from the base of the plant to prevent the fungus from spreading to healthy tissue.

2 Apply an organic fungicide to the plant to eliminate the active Botrytis spores.

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3 Improve air circulation and reduce humidity by ensuring the soil is not overly damp; use a moisture meter to monitor watering frequency.