Kalanchoe Passion Juventa White Cottony Spots - Causes & Fixes

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

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Mealybugs

These small insects secrete a white, waxy, cottony substance to protect themselves as they feed on the succulent's sap. They often cluster in the crevices between the fleshy leaves of Kalanchoe Passion Juventa.

Very Common

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How to confirm: Use a cotton swab dipped in rubbing alcohol to dab the spots; if they dissolve and turn brown, it is mealybugs.

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

2 Use a cotton swab dipped in isopropyl alcohol to manually remove the visible white cottony clusters from the leaf crevices.

3 Apply an organic insecticide spray to the entire plant, ensuring you coat the undersides of leaves and crevices to eliminate remaining insects and eggs.

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Powdery Mildew

This fungal pathogen manifests as white, flour-like patches on leaf surfaces, often triggered by high humidity and poor air circulation around the dense foliage of this cultivar. It can eventually cause the leaves to yellow and drop.

Common

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How to confirm: Check if the white spots are superficial on the leaf surface and if they spread in a dusty pattern across the foliage.

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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 dense foliage and reduce humidity by avoiding overhead watering.

3 Prune and dispose of heavily infected leaves to prevent the fungal pathogen from spreading to healthy parts of the plant.

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Cottony Blight (Botrytis)

In high-moisture environments, Botrytis can create fuzzy, greyish-white fungal growth on decaying plant tissue. This is particularly common if water sits in the crown of the Kalanchoe for extended periods.

Common

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How to confirm: Examine the base of the leaves for soft, rotting tissue accompanying the white fuzz.

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1 Prune away all affected plant tissue and any fuzzy greyish-white growth using sterilized shears to prevent the fungus from spreading.

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2 Apply an organic fungicide to the plant to combat the Botrytis spores and protect healthy leaves.

Bonide Captain Jack's Copper Fungicide 32 oz

0.9 L • 1 pcs • Organic

$12

In Stock

3 Adjust your watering technique to avoid getting water in the plant's crown and ensure the soil surface dries between waterings; use a moisture meter to monitor levels.