Zantedeschia aethiopica (Purple) White Powder - Causes & Fixes

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Powdery Mildew

This fungal disease thrives in high humidity and poor air circulation around the large leaves of Zantedeschia. It manifests as white, flour-like patches that can eventually lead to leaf necrosis and stunted growth.

Very Common

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How to confirm: Inspect the undersides of the leaves for fine white mycelium or spots that look like dusted flour.

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1 Apply an organic fungicide to eliminate the existing fungal spores and prevent further spread across the leaves.

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 by spacing it away from other dense foliage.

3 Prune and dispose of any heavily infected leaves to prevent the fungus from spreading to healthy parts of the plant.

Fiskars 5/8" Bypass Pruning Shears

Cutting Tools

$13

In Stock

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Mealybugs

These small, soft-bodied insects secrete a white, waxy, cottony substance to protect themselves. They often congregate at the base of the spathe or in the leaf axils of the Calla Lily, sucking sap from the plant.

Common

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How to confirm: Check the junctions where leaves meet the stem for tiny, moving white specs that feel sticky/waxy.

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shopping_cart Recommended Products

1 Isolate the plant immediately to prevent the mealybugs from spreading to other greenery and treat the visible white clusters with an organic insecticide spray.

Bonide Captain Jack's Neem Oil 32 oz

0.9 L • 1 pcs • Organic

$10

In Stock

2 Use a cotton swab dipped in isopropyl alcohol to manually remove any remaining cottony masses from the leaf axils and base of the spathe.

3 Monitor the soil moisture levels closely, as mealybugs often thrive on plants under environmental stress.

GROWIT Soil Moisture Meter - Blue

Water Meters

$12

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Hard Water/Mineral Deposits

If you use tap water with high mineral content, calcium or magnesium carbonates can precipitate on the leaf surface as it dries. This is not a biological pathogen but appears as white, crusty residue.

Common

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How to confirm: Wipe a small area of the white substance with a damp cloth; if it dissolves easily, it is likely mineral buildup.

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1 Gently wipe the leaves with a soft, damp cloth using distilled or filtered water to remove the mineral crust without damaging the plant tissue.

2 Switch to using rainwater or distilled water for future watering to prevent new calcium and magnesium carbonate deposits from forming on the foliage.

3 If the plant shows signs of nutrient imbalance from mineral buildup, apply a liquid supplement to restore essential levels.

FoxFarm Bush Doctor Cal Mag Liquid Supplement 1 Pint

0.5 L • 1 pcs • Organic

$22

In Stock

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Botrytis (Gray Mold) - Early Stage

In very moist conditions, Botrytis can begin as white, fuzzy patches on the spadix or foliage before turning gray. It is particularly common in Calla Lilies during periods of high humidity and damp soil.

Common

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How to confirm: Look for soft, rotting tissue underneath the white fuzz, especially near the base of the flower spathe.

build How to fix it

shopping_cart Recommended Products

1 Increase air circulation around the foliage and reduce humidity to prevent the fungus from spreading.

2 Apply an organic fungicide to treat the white patches and protect healthy plant tissues.