Zantedeschia Captain Murano White Powder - Causes & Fixes

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Powdery Mildew

A fungal infection caused by pathogens like Podosphaera takii, which thrives in high humidity and poor air circulation around the lush foliage of Calla Lilies. It manifests as a white, flour-like coating on the surface of the leaves.

Very Common

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How to confirm: Inspect the undersides of the leaves for small black fruiting bodies or fuzzy patches spreading across the leaf surface.

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1 Apply an organic fungicide to the affected leaves to eliminate the fungal pathogens and prevent the infection from spreading to healthy foliage.

Bonide Captain Jack's Copper Fungicide 32 oz

0.9 L • 1 pcs • Organic

$12

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2 Improve air circulation around the plant and reduce humidity by spacing plants further apart and avoiding overhead watering.

3 Prune and dispose of heavily infected leaves to remove the primary source of fungal spores from the plant environment.

Fiskars 5/8" Bypass Pruning Shears

Cutting Tools

$13

In Stock

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Mealybugs

These sap-sucking insects secrete a white, waxy, cottony substance to protect themselves while feeding on the stems and leaf bases of the Zantedeschia. Their presence often results in sticky residue (honeydew) on the foliage.

Common

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How to confirm: Use a magnifying glass to look for tiny, slow-moving white insects nestled in the crevices where the leaf meets the stem.

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shopping_cart Recommended Products

1 Isolate the plant immediately to prevent the mealybugs from spreading to other houseplants.

2 Treat the infestation by spraying the plant with an organic insecticide or neem oil to kill the insects and remove the waxy coating.

Bonide Captain Jack's Neem Oil 32 oz

0.9 L • 1 pcs • Organic

$10

In Stock

3 Wipe away visible white cottony clusters from the stems and leaf bases using a cotton swab dipped in isopropyl alcohol.

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Mineral/Hard Water Deposits

Calcium or magnesium carbonates from hard tap water can settle on the leaves as white, crusty spots after evaporation. Unlike fungi, these spots are usually dry and do not spread across the leaf tissue.

Common

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How to confirm: Try wiping a small area of the white spot with a damp cloth; if it disappears or smears easily without affecting the leaf structure, it is likely mineral buildup.

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shopping_cart Recommended Products

1 Gently wipe the leaves with a soft, damp cloth to remove the crusty mineral deposits from the leaf surface.

2 Switch to using distilled water, rainwater, or filtered water for future watering to prevent new calcium and magnesium buildup.

3 Monitor the soil moisture levels to ensure you aren't overwatering, which can exacerbate mineral accumulation in the pot.