Kalanchoe Passion Aris White Cottony Spots - Causes & Fixes

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

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Mealybugs

These small, sap-sucking insects produce a white, waxy, cottony secretion to protect themselves. In Kalanchoe species, they often cluster in the leaf axils and tight crevices of the succulent stems.

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 disappear, 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 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 leaf axils and stem crevices.

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Powdery Mildew

This fungal disease manifests as a white, powdery coating on the leaf surfaces. While more common in upright foliage, it can affect Kalanchoe when airflow is poor and humidity is high.

Common

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How to confirm: Check if the white spots look like a fine dusting of flour that can be wiped off with your finger without destroying the leaf tissue.

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1 Apply an organic fungicide to the affected leaves 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

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

3 Prune and discard any heavily infected leaves to prevent the fungus from spreading to healthy parts of the plant.

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Cottony Blight (Sclerotinia)

This fungal pathogen can cause white, fuzzy mycelium to appear on the fleshy leaves or stems of Kalanchoe. It typically thrives in high-humidity environments and causes tissue softening.

Common

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How to confirm: Inspect the area under the white fuzz for any signs of dark, sclerotia-like structures or mushy, decaying stem tissue.

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shopping_cart Recommended Products

1 Remove and discard all heavily infected leaves or stems to prevent the fungal mycelium from spreading to healthy tissue.

2 Apply an organic fungicide to the affected areas to control the spread of the blight.

Bonide Captain Jack's Copper Fungicide 32 oz

0.9 L • 1 pcs • Organic

$12

In Stock

3 Reduce humidity around the plant and ensure better airflow by spacing it away from other plants, and avoid overhead watering.