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Haworthia cooperi White Cottony Spots
eco White Cottony Spots

Haworthia cooperi – White Cottony Spots

Why does your Haworthia cooperi have white cottony spots? Diagnose the cause and fix it with our step-by-step guide.

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Jump to cause: Mealybugs Powdery Mildew Sclerotinia or Sap Residue

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Mealybugs

Mealybugs are small, soft-bodied insects that secrete a white, waxy, cotton-like substance to protect themselves. In Haworthia cooperi, they often congregate in the crevices between leaves or near the base of the plant, sucking sap and weakening the succulent.

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 tiny insects, it is mealybugs.
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1 Isolate the plant immediately to prevent the mealybugs from spreading to your other houseplants.
2 Carefully remove visible white cottony masses using a cotton swab dipped in isopropyl alcohol to kill the insects on contact.
3 Apply an organic insecticide spray to the plant to eliminate any remaining larvae or hidden pests.
Bonide Captain Jack's Neem Oil 32 oz
Bonide Captain Jack's Neem Oil 32 oz
0.9 L • 1 pcs • Organic
$10
In Stock
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Powdery Mildew

While less common in low-humidity succulent environments, high humidity and poor airflow can trigger fungal growth. This appears as a more superficial, dusty white coating on the translucent window surfaces of the leaves.

Common
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How to confirm: Check if the white spots can be easily wiped off with a damp cloth without leaving scarring on the leaf windows.
build How to fix it
shopping_cart Recommended Products
1 Apply an organic fungicide to the affected leaves to eliminate the powdery mildew spores and prevent further spread.
Bonide Captain Jack's Neem Oil 32 oz
Bonide Captain Jack's Neem Oil 32 oz
0.9 L • 1 pcs • Organic
$10
In Stock
2 Improve air circulation around the plant and reduce humidity levels to create an environment less conducive to fungal growth.
3 Gently wipe the translucent leaf windows with a soft, dry cloth to remove superficial fungal residue without damaging the plant tissue.
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Sclerotinia or Sap Residue

In some cases, dried sap or mineral deposits from hard water can create white, crusty patches. While not 'cottony' in a biological sense, these patches are often mistaken for pests by Haworthia owners.

Common
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How to confirm: Inspect if the spots are hard and crusty rather than fuzzy; if they don't move when disturbed, it may be mineral buildup.
build How to fix it
shopping_cart Recommended Products
1 Gently wipe the white patches with a soft, damp cotton swab to determine if the residue dissolves, which indicates mineral deposits or sap rather than pests.
2 If the spots are actually mealybugs (true cottony pests), treat the plant with an organic insecticide spray.
Bonide Captain Jack's Neem Oil 32 oz
Bonide Captain Jack's Neem Oil 32 oz
0.9 L • 1 pcs • Organic
$10
In Stock
3 To prevent future mineral buildup, use distilled or rainwater and monitor soil moisture levels with a meter to ensure the plant isn't sitting in stagnant water.
GROWIT Soil Moisture Meter - Blue
GROWIT Soil Moisture Meter - Blue
Water Meters
$12
In Stock
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