Crassula sp. Transvaal Drakensberg White Cottony Spots
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Crassula sp. Transvaal Drakensberg – White Cottony Spots

Why does your Crassula sp. Transvaal Drakensberg have white cottony spots? Diagnose the cause and fix it with our step-by-step guide.

search Possible Causes

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Mealybugs

These small insects secrete a white, waxy, cotton-like substance to protect themselves. They feed on the sap of Crassula succulents, often congregating in the crevices between leaves or near the stem base.

Very Common
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How to confirm: Use a toothpick to gently probe the white spots; if they move or reveal tiny insect bodies underneath, it is mealybugs.
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1 Isolate the plant immediately from other greenery to prevent the mealybugs from spreading to your entire collection.
2 Treat the infestation by spraying the plant with an organic insecticide/miticide to eliminate the insects and their waxy coating.
3 Use a cotton swab dipped in isopropyl alcohol to manually remove visible white cottony clusters from the crevices of the leaves and stem base.
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Powdery Mildew

A fungal disease that manifests as white, flour-like patches on the surface of the leaves. In Crassula species, this usually occurs due to poor air circulation and high humidity around the foliage.

Common
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How to confirm: Check if the white spots can be wiped off easily with a cloth without leaving a sticky residue.
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1 Apply an organic fungicide to eliminate the existing fungal patches and prevent further spread across the foliage.
2 Improve air circulation around the plant by spacing it away from other plants and ensuring a gentle breeze can reach the leaves.
3 Reduce humidity levels by avoiding overhead watering and allowing the soil to dry out completely between waterings.
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Cottony Blight (Sclerotinia)

While less common in succulents, certain fungal pathogens can create a white, fuzzy growth on decaying plant tissue. This typically follows an episode of overwatering or stem rot.

Common
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How to confirm: Inspect the base of the plant for any softening or dark, mushy discoloration in the stem.
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1 Immediately remove and discard any heavily decayed or mushy plant tissue to prevent the fungal spores from spreading to healthy parts of the Crassula.
2 Apply an organic fungicide to the affected area and surrounding stems to control the spread of the blight.
3 Improve airflow and adjust your watering schedule to ensure the soil dries out completely between waterings, preventing the moisture buildup that causes Sclerotinia.
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