Haworthia retusa White Cottony Spots - Causes & Fixes

Jump to cause: Mealybugs Cottony Scale Insects Sclerotinia (White Mold)

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Mealybugs

Mealybugs are common pests for Haworthia that secrete a white, waxy, cottony substance to protect themselves. They attach to the leaf bases and crevices of the plant, sucking sap and causing swelling or deformities in the translucent windows.

Very Common

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How to confirm: Use a cotton swab dipped in rubbing alcohol to dab the spots; if they dissolve instantly, it is likely mealybug residue.

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1 Isolate the plant immediately to prevent the spread of mealybugs to other houseplants.

2 Use a cotton swab dipped in isopropyl alcohol to manually remove the white cottony masses from the leaf bases and crevices.

3 Apply an organic insecticide spray to the plant to eliminate any remaining insects and larvae.

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Cottony Scale Insects

Similar to mealybugs, scale insects can produce a white, fuzzy coating as they mature. They settle on the succulent leaves of Haworthia retusa and can lead to stunted growth and leaf drop if left untreated.

Common

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How to confirm: Look for small, hard bumps under the white fluff that do not move when poked.

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1 Isolate the plant immediately to prevent the spread of scale insects to other houseplants.

2 Treat the affected areas by spraying the plant with an organic insecticide/miticide to eliminate the insects and their protective coating.

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3 Gently wipe away visible white cottony spots from the leaves using a cotton swab dipped in isopropyl alcohol.

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Sclerotinia (White Mold)

While less common in dry-growing succulents, high humidity can trigger fungal pathogens that manifest as white, fuzzy mycelium. This typically occurs if the plant's base remains damp for extended periods.

Common

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How to confirm: Check if the white spots are accompanied by soft, mushy tissue or a foul odor from the base of the plant.

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1 Remove any heavily infected tissue and increase airflow around the plant to reduce humidity levels.

2 Apply an organic fungicide to the affected area to stop the spread of the white mold.

Bonide Captain Jack's Neem Oil 32 oz

0.9 L • 1 pcs • Organic

$10

In Stock

3 Adjust your watering schedule to ensure the soil dries out completely between waterings, and use a moisture meter to monitor the root zone.