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Euphorbia tithymaloides White Cottony Spots
eco White Cottony Spots

Euphorbia tithymaloides – White Cottony Spots

Why does your Euphorbia tithymaloides 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 insects secrete a white, waxy, cotton-like substance to protect themselves while feeding on the succulent stems of the Euphorbia. They often cluster in the crevices where the cylindrical stems meet the leaves.

Very Common
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How to confirm: Use a magnifying glass to check for tiny, moving insects hidden within the white fluff or at the leaf nodes.
build How to fix it
shopping_cart Recommended Products
1 Isolate the plant immediately to prevent the mealybugs from spreading to your other houseplants.
2 Treat the infestation by spraying the plant with an organic insecticide to kill the insects and their protective waxy coating.
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 stem crevices.
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Cottony Scale

Scale insects can appear as white, fuzzy patches on the stems of the Pencil Tree. They attach themselves to the plant and suck the sap, which can eventually lead to stem discoloration or stunted growth.

Common
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How to confirm: Try gently scraping a white spot with a fingernail; if it is a hard shell protecting an insect, it is likely scale.
build How to fix it
shopping_cart Recommended Products
1 Treat the affected stems with an organic insecticide/fungicide spray to eliminate the scale insects and their eggs.
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 white cottony patches using a cotton swab dipped in isopropyl alcohol to prevent further sap depletion.
3 Isolate the plant from other greenery to prevent the scale insects from spreading to healthy plants.
warning

Powdery Mildew

While less common in succulents, high humidity and poor airflow can cause this fungal disease to appear as a white, dusty coating on the leaves. Unlike mealybugs, this looks more like flour dusted on the surface.

Common
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How to confirm: Check if the white spots can be easily rubbed off the leaf surface with your finger like dust.
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 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 and reduce humidity levels to create an environment less hospitable to fungal growth.
3 Prune and dispose of any heavily infected stems to prevent the fungus from spreading to healthy parts of the plant.
Fiskars 5/8" Bypass Pruning Shears
Fiskars 5/8" Bypass Pruning Shears
Cutting Tools
$13
In Stock

Other Euphorbia tithymaloides 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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