Zantedeschia Captain Brunello White Powder - Causes & Fixes

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Powdery Mildew

This fungal disease is common in Zantedeschia when humidity is high and air circulation is poor. It manifests as a white, flour-like coating on the leaves that can eventually lead to leaf necrosis.

Very Common

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How to confirm: Inspect if the white patches are superficial and can be rubbed off with your finger.

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

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 by avoiding overhead watering, which keeps leaves dry.

3 Prune and dispose of 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, sap-sucking insects secrete a white, waxy, cottony substance to protect themselves. In Captain Brunello, they often congregate at the base of the spathe or on the undersides of leaves.

Common

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How to confirm: Look for tiny, slow-moving bumps or sticky residue (honeydew) on the leaf stems.

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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/miticide to eliminate the insects and their waxy coating.

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 base of the spathe and leaf undersides.

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Calcium Deficiency

While less common as a 'powder,' extreme mineral imbalances can cause physiological spotting that may appear as pale, desiccated patches. This disrupts cell wall formation in the developing leaves of the Calla Lily.

Common

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How to confirm: Check if the newest leaves are emerging distorted or with bleached-looking edges.

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1 Apply a calcium and magnesium supplement to strengthen cell walls and address the mineral imbalance.