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Euphorbia tirucalli White Cottony Spots
eco White Cottony Spots

Euphorbia tirucalli – White Cottony Spots

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

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Jump to cause: Mealybugs Cottony Scale Powdery Mildew

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Mealybugs

These small, sap-sucking insects produce a white, waxy, cottony secretion to protect themselves. They attach to the succulent stems of Euphorbia tirucalli and drain the plant's fluids, often causing branch dieback.

Very Common
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How to confirm: Use a magnifying glass or smartphone zoom to look for small, oval-shaped insects hidden in the crevices of the stem junctions.
build How to fix it
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1 Isolate the plant immediately to prevent the mealybugs from spreading to other houseplants.
2 Treat the affected stems by spraying the plant with an organic insecticide to eliminate the insects and their waxy secretions.
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 Use a cotton swab dipped in isopropyl alcohol to manually remove visible white cottony clusters from the succulent branches.
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Cottony Scale

Similar to mealybugs, scale insects produce a white, fuzzy covering. They embed themselves into the thin, pencil-like branches of the plant, which can lead to yellowing and structural weakness in the stems.

Common
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How to confirm: Gently scrape the white spots with a fingernail; if a hard shell or insect body is underneath, it is scale.
build How to fix it
shopping_cart Recommended Products
1 Treat the affected stems with an organic insecticide spray to eliminate the scale insects and their white fuzzy coverings.
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 Manually remove visible cottony clusters using a cotton swab dipped in isopropyl alcohol to prevent further infestation.
3 Isolate the plant from other greenery to stop the spread of scale to your other houseplants.
warning

Powdery Mildew

This fungal pathogen manifests as a white, flour-like coating on the surface of the stems. While more common in high humidity, it can affect Euphorbia if air circulation is poor.

Common
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How to confirm: Check if the white spots can be wiped off easily with a damp cloth without revealing insect bodies underneath.
build How to fix it
shopping_cart Recommended Products
1 Apply an organic fungicide to the affected stems to eliminate the powdery mildew spores and prevent further spread.
Bonide Captain Jack's Copper Fungicide 32 oz
Bonide Captain Jack's Copper Fungicide 32 oz
0.9 L • 1 pcs • Organic
$12
In Stock
2 Improve air circulation around the plant by spacing it away from other foliage and ensuring a gentle breeze can reach the stems.
3 Prune and dispose of any heavily infected stems to reduce the fungal load on the rest of the plant.
Gonicc 8" Titanium Bypass Pruners GPPS-1003
Gonicc 8" Titanium Bypass Pruners GPPS-1003
Cutting Tools
$15
In Stock

Other Euphorbia tirucalli problems

Your plant might also be experiencing one of these issues:

eco Sudden Leaf Drop chevron_right
local_hospital All symptoms eco All plants with white cottony spots
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