Sedum clavatum White Cottony Spots - Causes & Fixes

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

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Mealybugs

These small, soft-bodied insects secrete a white, waxy, cotton-like substance to protect themselves. In Sedum clavatum, they often cluster in the crevices between the fleshy leaves and near the base of the plant.

Very Common

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How to confirm: Use a cotton swab dipped in isopropyl alcohol to dab the white spots; if the white material dissolves and reveals small insects underneath, it is 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 disease manifests as a white, dusty coating on the leaf surfaces. While more common in humid environments, high moisture trapped between the tight leaves of this succulent can trigger outbreaks.

Common

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

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1 Apply an organic fungicide to the affected leaves to eliminate the fungal spores and prevent the spread of powdery mildew.

Bonide Captain Jack's Neem Oil 32 oz

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2 Improve air circulation around the plant and reduce humidity by ensuring the leaves stay dry during watering.

3 Prune and dispose of any heavily infected foliage to prevent the fungus from spreading to healthy parts of the Sedum.

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Cottony Blight (Botrytis)

In conditions of high humidity and poor airflow, Botrytis can cause fuzzy, grayish-white fungal growth. In Sedum clavatum, this typically attacks decaying organic matter or wounded leaf tissue.

Common

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How to confirm: Inspect the base of the white spots for any signs of soft, brownish rot on the succulent leaves.

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1 Prune and remove all affected leaves or decaying organic matter immediately to prevent the fungus from spreading to healthy tissue.

2 Apply an organic fungicide to treat the remaining fungal spores and protect the plant from further infection.

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 reduce humidity by ensuring the soil surface dries out between waterings.