Sedum treleasei White Cottony Spots - Causes & Fixes

Jump to cause: Mealybugs Cottony Scale Botrytis (Gray Mold)

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Mealybugs

These small insects secrete a white, waxy, cotton-like substance to protect themselves while feeding on the sap of Sedum treleasei. They often cluster in the crevices between the fleshy leaves and stems.

Very Common

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How to confirm: Inspect the tight junctions where leaves meet the stem for tiny, moving white insects or sticky residue.

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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 stems and leaves.

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Cottony Scale

Similar to mealybugs, these pests create a white, fuzzy appearance on the succulent tissues of the stonecrop. They can cause the leaves to yellow and eventually drop if the infestation becomes severe.

Common

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How to confirm: Look for small, stationary bumps under the white fuzz that do not move when prodded with a toothpick.

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1 Treat the infestation immediately with an organic insecticide/miticide spray to eliminate the cottony scale insects and their eggs.

Bonide Captain Jack's Neem Oil 32 oz

0.9 L • 1 pcs • Organic

$10

In Stock

2 Manually remove visible white clusters using a cotton swab dipped in isopropyl alcohol to prevent further spread to healthy tissue.

3 Isolate the plant from other succulents to prevent the pests from migrating to your healthy collection.

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Botrytis (Gray Mold)

While usually characterized by gray fuzz, early stages of Botrytis in high-humidity environments can appear as white, fuzzy patches on decaying succulent tissue. This is common if the Sedum treleasei has poor air circulation.

Common

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How to confirm: Check if the white spots are accompanied by softening or rotting of the leaf tissue.

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1 Prune away all affected white, fuzzy tissue and any decaying leaves immediately to prevent the mold from spreading to healthy parts of the plant.

2 Apply an organic fungicide to protect the remaining healthy tissue and control the fungal growth.

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 is not overly saturated and the plant is not in a stagnant environment.