Lobivia arachnacantha White Cottony Spots - Causes & Fixes

Jump to cause: Mealybugs Cottony Scale Fungal Mycelium (Mold)

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Mealybugs

These small insects secrete a white, waxy, cottony substance to protect themselves as they feed on the sap of your Lobivia. They often congregate in the crevices between the cactus ribs or near the base of the plant.

Very Common

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How to confirm: Use a magnifying glass to look for tiny, moving insects or white clusters nestled deep within the cactus's areoles.

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

2 Treat the infestation by spraying the plant with an organic insecticide/miticide to eliminate the insects and their waxy coating.

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

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Cottony Scale

Scale insects can appear as fuzzy white patches on the stem of the Lobivia. Unlike mealybugs, they are often more stationary and can cause the cactus tissue to become slightly discolored or sunken.

Common

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How to confirm: Try gently scraping a spot with a fingernail; if a hard shell remains but the white fluff comes off, it is likely scale.

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1 Treat the cactus with an organic insecticide spray to eliminate the scale insects and their eggs.

Bonide Captain Jack's Neem Oil 32 oz

0.9 L • 1 pcs • Organic

$10

In Stock

2 Carefully remove visible white cottony patches using a cotton swab dipped in isopropyl alcohol to prevent further spread.

3 Isolate the plant from other succulents to prevent the scale from spreading to your healthy collection.

warning

Fungal Mycelium (Mold)

If the humidity around your Lobivia is too high or soil drainage is poor, fungal spores can manifest as white, thread-like mycelium on the surface of the plant or the soil.

Common

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How to confirm: Check if the white spots are accompanied by soft, mushy areas on the cactus skin, which indicates rot-related mold.

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1 Improve air circulation around the plant and reduce humidity to prevent further fungal growth.

2 Apply a fungicide to treat the existing mycelium and protect the plant from spreading spores.