Sedum sarmentosum White Cottony Spots - Causes & Fixes

Jump to cause: Mealybugs Powdery Mildew Cottony Scale

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Mealybugs

These small, soft-bodied insects produce a white, waxy, cotton-like secretion to protect themselves. They feed on the sap of Sedum sarmentosum, often congregating in the crevices between leaf nodes and stems.

Very Common

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How to confirm: Use a magnifying glass to check if the white spots move or are attached to the stem junctions.

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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 to eliminate the insects and their waxy secretions.

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3 Use a cotton swab dipped in isopropyl alcohol to manually remove visible white cottony clusters from the stems and leaf nodes.

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Powdery Mildew

This fungal pathogen manifests as white, flour-like patches on the surface of the foliage. It thrives in high humidity and poor air circulation around the dense mats of Sedum sarmentosum.

Common

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How to confirm: Check if the white spots can be wiped off with a finger and if they appear more like a film than distinct tufts.

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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 Neem Oil 32 oz

0.9 L • 1 pcs • Organic

$10

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

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

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Cottony Scale

Certain species of scale insects produce a white, flocculent covering that mimics cotton. This can cause the trailing stems of your Sedum to weaken and eventually turn yellow or brown.

Common

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How to confirm: Look for small, hard bumps underneath the white fuzz on the plant stems.

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shopping_cart Recommended Products

1 Treat the affected stems with an organic insecticide/miticide spray to eliminate the scale insects and their white coverings.

Bonide Captain Jack's Neem Oil 32 oz

0.9 L • 1 pcs • Organic

$10

In Stock

2 Carefully wipe away visible cottony spots from the stems using a cotton swab dipped in isopropyl alcohol to prevent further spread.

3 Monitor soil moisture levels closely, as overwatering can create the humid conditions that scale insects thrive in.