Lithops pseudotruncatella White Cottony Spots - Causes & Fixes

Jump to cause: Mealybugs Fungal/Bacterial Soft Rot (Early stage) Powdery Mildew

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Mealybugs

These small, white, sap-sucking insects produce a waxy, cottony secretion to protect themselves. In Lithops, they often hide in the crevices between the leaf pairs or near the base of the plant.

Very Common

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How to confirm: Use a toothpick to gently probe the white spots; if they move or break apart into small bits, it is likely mealybugs.

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1 Isolate the Lithops immediately to prevent the mealybugs from spreading to other plants in your collection.

2 Carefully remove the white cottony masses using a cotton swab dipped in isopropyl alcohol, being extremely gentle to avoid damaging the succulent's sensitive leaf structure.

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

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Fungal/Bacterial Soft Rot (Early stage)

In high humidity or overwatered conditions, certain fungi can produce white, fuzzy mycelium on the surface of the stone. This often precedes the collapse and liquefaction of the Lithops body.

Common

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How to confirm: Check if the white spots are accompanied by any softening or discoloration of the leaf tissue.

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1 Immediately remove the affected Lithops from the soil and inspect for any mushy or liquefied tissue; discard any parts that have already begun to rot to prevent spreading.

2 Treat the remaining healthy tissue with a fungicide to halt fungal growth and repot the plant in a highly porous, well-draining substrate like a mix containing perlite or clay pebbles.

3 Ensure the plant is in a low-humidity environment and use a moisture meter to prevent future overwatering by only watering when the soil is completely dry.

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Powdery Mildew

While less common in succulents than in leafy plants, high humidity can trigger a powdery fungal growth on the epidermis. It appears as a fine white dusting rather than distinct cottony clumps.

Common

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How to confirm: Wipe a small area with a damp cloth to see if the white residue disappears or stays embedded in the plant skin.

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shopping_cart Recommended Products

1 Apply an organic fungicide to the affected areas to eliminate the fungal spores and prevent further spread.

Bonide Captain Jack's Neem Oil 32 oz

0.9 L • 1 pcs • Organic

$10

In Stock

2 Improve air circulation around the Lithops and reduce humidity levels to create an environment less conducive to fungal growth.

3 Ensure the plant is in a well-draining substrate with added perlite to prevent moisture retention around the plant body.