Sedum pachyphyllum White Cottony Spots - Causes & Fixes

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

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Mealybugs

These small insects secrete a white, waxy, cotton-like substance to protect themselves as they suck sap from the fleshy leaves of Sedum pachyphyllum. They often congregate in the crevices where the leaves meet the stem.

Very Common

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How to confirm: Use a cotton swab dipped in rubbing alcohol to dab the spots; if they dissolve and turn brown, 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 any visible white cottony clusters from the crevices of the leaves.

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Powdery Mildew

This fungal pathogen manifests as a white, dusty coating on the leaf surfaces, often appearing when there is high humidity and poor airflow around the succulent. Unlike insects, this looks more like fine flour dusted over the plant.

Common

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How to confirm: Check if the white spots can be easily wiped off with your finger or if they appear as a fuzzy film across large areas of the foliage.

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1 Apply an organic fungicide to eliminate the fungal spores on the leaf surfaces.

Bonide Captain Jack's Neem Oil 32 oz

0.9 L • 1 pcs • Organic

$10

In Stock

2 Improve airflow around the plant and reduce humidity by spacing it away from other plants.

3 Prune and dispose of any heavily infected leaves to prevent the spread of the pathogen.

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Cottony Blight (Botrytis)

In high-moisture environments, Botrytis can cause grayish-white fuzzy patches on decaying plant tissue. In Sedum pachyphyllum, this usually starts on bruised or overwatered leaves that are beginning to rot.

Common

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How to confirm: Inspect the base of the white spots to see if the underlying leaf tissue is turning translucent, soft, or brown.

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shopping_cart Recommended Products

1 Prune and remove all affected leaves or stems showing white fuzzy patches to prevent the fungus from spreading to healthy tissue.

2 Apply a fungicide to protect the remaining plant tissue and improve air circulation around the foliage.