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Crassula conjuncta White Cottony Spots
eco White Cottony Spots

Crassula conjuncta – White Cottony Spots

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

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

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Mealybugs

These small, soft-bodied insects produce a white, waxy, cotton-like secretion to protect themselves. They feed on the sap of Crassula conjuncta, which can lead to leaf yellowing and stunted growth.

Very Common
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How to confirm: Use a toothpick to gently probe the white spots; if they move or feel fuzzy/compressible, it is likely mealybugs.
build How to fix it
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1 Isolate the plant immediately to prevent the mealybugs from spreading to other houseplants.
2 Treat the infestation by spraying the plant with an organic insecticide to kill the insects and their waxy secretions.
Bonide Captain Jack's Neem Oil 32 oz
Bonide Captain Jack's Neem Oil 32 oz
0.9 L • 1 pcs • Organic
$10
In Stock
3 Gently wipe away visible white cottony spots using a cotton swab dipped in isopropyl alcohol to remove adult bugs and eggs.
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Powdery Mildew

This fungal disease appears as a white, powdery coating on the surface of the leaves. In Crassula conjuncta, it thrives when there is high humidity combined with low air circulation around the thick leaves.

Common
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How to confirm: Rub the white spots with your finger; powdery mildew often wipes off easily like dust, whereas mealybugs are physically attached to the plant.
build How to fix it
shopping_cart Recommended Products
1 Apply an organic fungicide to the affected leaves to eliminate the powdery mildew spores and prevent further spread.
Bonide Captain Jack's Neem Oil 32 oz
Bonide Captain Jack's Neem Oil 32 oz
0.9 L • 1 pcs • Organic
$10
In Stock
2 Improve air circulation around the plant and reduce humidity by avoiding overhead watering and ensuring the plant is not crowded.
3 Prune and discard any heavily infected leaves to reduce the fungal load on the plant.
Gonicc 8" Titanium Bypass Pruners GPPS-1003
Gonicc 8" Titanium Bypass Pruners GPPS-1003
Cutting Tools
$15
In Stock
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Cottony Blight (Sclerotinia)

While less common in succulents than insects, certain fungal pathogens can manifest as white, mycelium-like growths on the plant tissue. This usually occurs in environments with high humidity and poor airflow.

Common
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How to confirm: Check if the white spots are accompanied by soft, rotting tissue or dark lesions on the stems.
build How to fix it
shopping_cart Recommended Products
1 Remove and discard all heavily infected plant tissue to prevent the fungal mycelium from spreading to healthy parts of the Crassula.
2 Apply an organic fungicide to the affected areas to combat the Sclerotinia pathogen and protect remaining healthy tissue.
Bonide Captain Jack's Copper Fungicide 32 oz
Bonide Captain Jack's Copper Fungicide 32 oz
0.9 L • 1 pcs • Organic
$12
In Stock
3 Improve air circulation around the plant and reduce humidity by ensuring the soil dries out between waterings, using a moisture meter to monitor levels.
GROWIT Soil Moisture Meter SMM-V3
GROWIT Soil Moisture Meter SMM-V3
Water Meters
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