Kalanchoe Rosalina Don Juan White Cottony Spots - Causes & Fixes

Jump to cause: Mealybugs Powdery Mildew Cottony Scale

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Mealybugs

Mealybugs are small, soft-bodied insects that secrete a white, waxy, cottony substance to protect themselves. They cluster in the crevices of Kalanchoe leaves and stems, feeding on plant sap and causing stunted growth.

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 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 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

In Stock

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

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Powdery Mildew

This fungal pathogen manifests as a white, flour-like coating on the surface of the foliage. It thrives in high humidity and poor air circulation around the dense leaves of the Don Juan Kalanchoe.

Common

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How to confirm: Check if the white spots appear more like a dusting on the leaf surface rather than distinct, raised cottony clumps.

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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

In Stock

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

3 Prune and dispose of heavily infected leaves to reduce the fungal load on the plant.

Fiskars 5/8" Bypass Pruning Shears

Cutting Tools

$13

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Cottony Scale

Certain types of scale insects produce a white, filamentous covering that resembles cotton. These pests attach firmly to the stems of succulent plants like Kalanchoe to suck nutrients from the vascular system.

Common

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How to confirm: Inspect the stems closely to see if the white spots are attached to a hard, immobile body beneath the fuzz.

build How to fix it

shopping_cart Recommended Products

1 Treat the plant 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 Manually remove visible cottony clusters using a cotton swab dipped in isopropyl alcohol to prevent further spreading.

3 Isolate the plant from other greenery to stop the transfer of pests to healthy succulents.