Zantedeschia Captain Reno White Powder - Causes & Fixes

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Powdery Mildew

This fungal pathogen thrives in humid conditions with poor air circulation around the large foliage of Calla Lilies. It manifests as a white, talcum-like coating on the leaves and can eventually cause the foliage to wither.

Very Common

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How to confirm: Inspect if the white patches can be rubbed off easily with your finger or if they appear as fuzzy growth.

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1 Apply an organic fungicide to eliminate the existing fungal spores on the leaf surfaces.

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2 Prune and dispose of heavily infected leaves to prevent the spread of spores to healthy foliage.

3 Improve air circulation around the plant and avoid overhead watering to reduce the humidity that fuels mildew growth.

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Mealybugs

These small, soft-bodied insects secrete a white, waxy, cottony substance to protect themselves. They often congregate in the leaf axils and beneath the large leaves of 'Captain Reno', sucking sap from the plant.

Common

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How to confirm: Use a magnifying glass to check for tiny, slow-moving insects nestled at the base of the leaves or stems.

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

2 Treat the infestation by spraying the plant with an organic insecticide/miticide to kill the insects and remove the waxy coating.

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0.9 L • 1 pcs • Organic

$10

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3 Gently wipe away visible white cottony clusters from the leaf axils using a cotton swab dipped in isopropyl alcohol.

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Hard Water/Mineral Deposits

If you use tap water high in calcium or magnesium, white crusty deposits can form on the surface of the leaves as water evaporates. This is not a biological pathogen but a physical buildup of minerals.

Common

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How to confirm: Check if the white spots are hard or crusty and located specifically where water droplets have dried on the foliage.

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1 Gently wipe the leaves with a soft, damp cloth to remove the mineral buildup and prevent further crusting.

2 Switch to using distilled water, rainwater, or filtered water to prevent new calcium and magnesium deposits from forming.

3 Monitor soil mineral levels and supplement with a balanced fertilizer to ensure the plant isn't experiencing nutrient lockout from the buildup.