Sedum tetractinum White Cottony Spots - Causes & Fixes

Jump to cause: Mealybugs Powdery Mildew Cottony Scale

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Mealybugs

These small insects secrete a white, waxy, cotton-like substance to protect themselves. They congregate in the crevices of Sedum tetractinum's tight stem clusters and leaves, sucking the sap and weakening the plant.

Very Common

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How to confirm: Use a magnifying glass to check for tiny, crawling insects hidden deep within the leaf axils or at the base of the stems.

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

2 Treat the infestation by spraying the plant with an organic insecticide or neem oil to kill the insects and remove the waxy coating.

Bonide Captain Jack's Neem Oil 32 oz

0.9 L • 1 pcs • Organic

$10

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3 Use a cotton swab dipped in isopropyl alcohol to manually remove any visible white cottony clusters from the stem crevices.

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Powdery Mildew

This fungal pathogen appears as white, dusty patches on the surface of the foliage. It thrives in high humidity and poor air circulation around the dense, mat-forming structure of the Stonecrop.

Common

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How to confirm: Rub a finger across the white spot; if it feels like fine dust that can be wiped off easily, it is likely powdery mildew.

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1 Apply an organic fungicide to the affected foliage to eliminate the powdery mildew spores and prevent further spread.

Bonide Captain Jack's Copper Fungicide 32 oz

0.9 L • 1 pcs • Organic

$12

In Stock

2 Improve air circulation around the plant by thinning out dense areas and ensuring it is not crowded by other plants.

3 Reduce humidity levels by avoiding overhead watering and ensuring the plant is in a well-ventilated location.

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Cottony Scale

Similar to mealybugs, scale insects produce a white, fluffy coating. In Sedum species, they can cause the fleshy leaves to become distorted or discolored as they feed on plant fluids.

Common

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How to confirm: Look for small, immobile bumps under the cottony fluff that do not move when disturbed.

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shopping_cart Recommended Products

1 Treat the plant with an organic insecticide 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 cottony clusters using a cotton swab dipped in isopropyl alcohol to prevent further feeding.

3 Isolate the affected Sedum from other houseplants to prevent the scale from spreading to healthy plants.