Sedum Comic Tom White Cottony Spots - Causes & Fixes

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

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Mealybugs

These small, sap-sucking insects produce a white, waxy, cotton-like secretion to protect themselves. In Sedum species, they often congregate in the tight crevices between fleshy leaves and near the stem bases.

Very Common

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How to confirm: Use a cotton swab dipped in rubbing alcohol to dab the white spots; if they dissolve and turn brown, 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/miticide to kill the insects and their waxy coatings.

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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 and stem bases.

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Powdery Mildew

A fungal pathogen that manifests as a white, flour-like coating on the surface of the leaves. While more common in shade, high humidity and poor airflow around the succulent foliage can trigger outbreaks in Sedum.

Common

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How to confirm: Check if the white spots look like a thin film that can be wiped off or if they appear to be growing 'on' rather than emerging from the plant tissue.

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1 Apply an organic fungicide to the affected foliage to eliminate the fungal pathogen and prevent further spread.

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2 Improve air circulation around the plant and reduce humidity by avoiding overhead watering on the leaves.

3 Prune and dispose of any heavily infected leaves to reduce the fungal load on the rest of the plant.

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Cottony Blight (Botrytis)

This fungal disease thrives in damp, stagnant conditions around succulent leaves. It can cause grayish-white fuzzy growth that eventually leads to the softening and rotting of the 'Comic Tom' foliage.

Common

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How to confirm: Examine the base of the white spots for any signs of mushy, darkened, or decaying leaf tissue.

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shopping_cart Recommended Products

1 Remove and discard all heavily affected foliage to prevent the fungal spores from spreading to healthy parts of the plant.

2 Apply an organic fungicide to the remaining healthy tissue to control the spread of the blight.

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3 Improve air circulation around the plant and ensure the soil surface dries out between waterings to eliminate the damp, stagnant conditions the fungus prefers.