Kalanchoe Passion Poseidon White Cottony Spots - Causes & Fixes

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

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Mealybugs

These small, soft-bodied insects produce a white, waxy, cotton-like secretion to protect themselves. In Kalanchoe species, they often cluster in the crevices of the leaf junctions and under the thick, succulent leaves.

Very Common

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How to confirm: Use a cotton swab dipped in rubbing alcohol to dab the white spots; if the white substance dissolves and reveals tiny moving insects, it is mealybugs.

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

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 leaf junctions and crevices.

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Powdery Mildew

This fungal pathogen manifests as a white, dusty coating on the leaf surfaces. It thrives in Kalanchoe environments with high humidity and poor air circulation around the fleshy foliage.

Common

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How to confirm: Check if the white spots look like flour dusted on the leaves and if they can be wiped off easily without leaving a residue of insects.

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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

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2 Improve air circulation around the foliage and reduce humidity by spacing plants further apart and avoiding overhead watering.

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 (Botrytis)

While less common in succulents, high moisture levels can trigger Botrytis, which presents as grayish-white fuzzy patches, often starting on decaying floral parts or leaf edges.

Common

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How to confirm: Inspect the base of the flowers and older leaves for signs of soft, dark rot accompanying the white fuzz.

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shopping_cart Recommended Products

1 Prune and remove all affected floral parts and decaying leaves immediately to prevent the fungus from spreading to healthy tissue.

2 Apply an organic fungicide to protect the remaining healthy plant tissue from further fungal development.

Bonide Captain Jack's Copper Fungicide 32 oz

0.9 L • 1 pcs • Organic

$12

In Stock

3 Improve air circulation around the plant and reduce watering frequency to ensure the soil and foliage do not remain excessively damp.