Dudleya greenei White Cottony Spots - Causes & Fixes

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

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Mealybugs

Mealybugs are common pests for succulents like Dudleya greenei, secreting a white, waxy, cottony substance to protect themselves. They feed on the plant's sap, which can lead to leaf yellowing and stunted growth.

Very Common

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How to confirm: Use a magnifying glass to look for small, crawling insects at the base of the leaves or in the crevices of the rosette.

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

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 any visible white cottony clusters from the leaf crevices.

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Powdery Mildew

This fungal disease manifests as white, flour-like patches on the leaf surfaces. In Dudleya species, high humidity and poor air circulation around the rosette can trigger outbreaks.

Common

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How to confirm: Check if the white spots can be wiped off easily with a damp cloth or if they appear to be growing within the leaf tissue.

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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 rosette and reduce humidity by avoiding overhead watering.

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

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Cottony Blight (Botrytis)

Botrytis can cause fuzzy, gray-to-white fungal growth, especially on decaying organic matter or bruised leaves of Dudleya. It thrives in damp environments where moisture stays trapped in the center of the plant.

Common

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How to confirm: Inspect the base of the leaves for signs of soft, mushy rot accompanying the white fuzz.

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1 Remove and discard all heavily affected or decaying leaves to prevent the fungal spores from spreading to healthy tissue.

2 Improve air circulation around the plant and ensure the center of the Dudleya remains dry by avoiding overhead watering.

3 Apply an organic fungicide to protect the remaining healthy foliage from further infection.