Echeveria onslow White Cottony Spots - Causes & Fixes

Jump to cause: Mealybugs Cottony Blight (Fungal/Oomycete) Powdery Mildew

search Possible Causes

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Mealybugs

These small insects produce a white, waxy, cotton-like secretion to protect themselves. They congregate in the tight crevices between the Echeveria onslow's fleshy leaves and suck the sap from the plant.

Very Common

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How to confirm: Use a toothpick or magnifying glass to inspect the leaf axils for tiny, moving insects hidden under the white fuzz.

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1 Isolate the plant immediately to prevent the mealybugs from spreading to your other houseplants.

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

Bonide Captain Jack's Neem Oil 32 oz

0.9 L • 1 pcs • Organic

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

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Cottony Blight (Fungal/Oomycete)

Certain fungal pathogens can manifest as white, fuzzy patches on organic matter. In succulents like Echeveria, this often follows periods of high humidity or poor air circulation around the rosette.

Common

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How to confirm: Check if the white spots are accompanied by soft, rotting tissue or a distinct musty odor near the base of the plant.

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1 Apply an organic fungicide to the affected areas to halt the spread of the fungal pathogen.

Bonide Captain Jack's Copper Fungicide 32 oz

0.9 L • 1 pcs • Organic

$12

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2 Improve air circulation around the rosette and reduce humidity by avoiding overhead watering.

3 Prune away any heavily infected leaves using sterilized tools to prevent further contamination.

Fiskars 5/8" Bypass Pruning Shears

Cutting Tools

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Powdery Mildew

While less common in true succulents than in foliage plants, powdery mildew can appear as a white dusty coating on the surface of Echeveria leaves if environmental humidity is excessively high.

Common

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How to confirm: Observe if the white spots can be wiped off easily with your finger, leaving a clean surface underneath.

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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

0.9 L • 1 pcs • Organic

$10

In Stock

2 Improve air circulation around the plant and reduce humidity by avoiding overhead watering, which keeps the leaves dry.

3 Prune and discard any heavily infected leaves to prevent the fungus from colonizing the rest of the Echeveria.