Echeveria runyonii White Cottony Spots - Causes & Fixes

Jump to cause: Mealybug Infestation Powdery Mildew Cottony Blight (Botrytis)

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Mealybug Infestation

Mealybugs are small, sap-sucking insects that secrete a white, waxy, cottony substance to protect themselves. In Echeveria, they often hide in the tight crevices between the fleshy leaves and can cause leaf drop or rot.

Very Common

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How to confirm: Use a wooden toothpick to probe the white spots; if they move or break apart into small clusters, it is likely mealybugs.

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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 or neem oil to kill the insects and remove the 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 pathogen manifests as a white, flour-like coating on the leaf surfaces. While more common in high humidity, it can affect Echeveria if airflow is restricted around the rosette.

Common

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How to confirm: Check if the white spots can be wiped off easily with a damp cloth and if the underlying leaf tissue remains healthy.

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1 Treat the affected leaves immediately with an organic fungicide to stop the spread of the fungal spores.

Bonide Captain Jack's Neem Oil 32 oz

0.9 L • 1 pcs • Organic

$10

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2 Improve air circulation around the rosette and reduce humidity to prevent the pathogen from thriving.

3 Prune and discard any heavily infected leaves to prevent the mildew from spreading to healthy parts of the plant.

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Cottony Blight (Botrytis)

This fungus thrives in moist, stagnant conditions within the rosette center. It creates fuzzy, gray-to-white patches that can quickly lead to the total collapse of the succulent's structure.

Common

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How to confirm: Inspect the base of the leaves for any signs of softening or dark, mushy rot accompanying the white fuzz.

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1 Remove any heavily affected leaves or debris from the rosette center to prevent the fungus from spreading to the core.

2 Apply an organic fungicide to the affected areas to control the blight and protect healthy tissue.

Bonide Captain Jack's Neem Oil 32 oz

0.9 L • 1 pcs • Organic

$10

In Stock

3 Improve air circulation around the plant and ensure the soil is not staying overly saturated, as moisture is the primary driver of this blight.