Crassula mesembryanthoides ssp. hispida White Cottony Spots - Causes & Fixes

Jump to cause: Mealybug Infestation Powdery Mildew Cottony Blight (Botrytis)

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Mealybug Infestation

Mealybugs are common pests for succulents like Crassula that secrete a white, waxy, cottony substance to protect themselves. They feed on the plant's sap, which can lead to yellowing of the fleshy leaves and 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 succulents and houseplants.

2 Treat the infestation by spraying the plant thoroughly with an organic insecticide/miticide to eliminate the pests and their eggs.

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3 Use a cotton swab dipped in isopropyl alcohol to manually remove any visible white cottony clusters from the crevices of the leaves.

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Powdery Mildew

This fungal pathogen manifests as white, dusty patches on the surface of the leaves. In Crassula mesembryanthoides, high humidity or poor air circulation around the hairy foliage can create an ideal environment for spore germination.

Common

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How to confirm: Check if the white spots can be wiped off easily with a finger, leaving a clean surface underneath.

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1 Apply an organic fungicide to eliminate existing fungal spores and prevent further spread across the foliage.

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2 Improve air circulation around the plant and reduce humidity by avoiding overhead watering, especially near the hairy leaves.

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

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Cottony Blight (Botrytis)

In cases of excessive moisture retention in the substrate, Botrytis can cause gray/white fuzzy growth. The 'hairy' nature of this specific subspecies can trap moisture against the leaf surface, facilitating fungal decay.

Common

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How to confirm: Inspect the base of the leaves for signs of softening or dark, mushy rot accompanied by the white fuzz.

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1 Remove all affected leaves and debris to prevent the fungal spores from spreading to healthy tissue.

2 Reduce watering frequency and ensure the substrate is completely dry before next application to eliminate excess moisture.