Zantedeschia Captain Kelso White Powder - Causes & Fixes

search Possible Causes

error

Powdery Mildew

This fungal disease commonly affects Zantedeschia when humidity is high and air circulation is poor, appearing as white, flour-like patches on the leaf surfaces.

Very Common

lightbulb

How to confirm: Inspect if the white spots can be rubbed off easily with your finger or if they appear in circular patches.

build How to fix it

shopping_cart Recommended Products

1 Apply an organic fungicide to the affected leaves to eliminate the powdery mildew fungus and prevent further spread.

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 spacing plants further apart and avoiding overhead watering.

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

warning

Mealybugs

These small, soft-bodied insects secrete a white, waxy, cottony substance that looks like powder or fuzz, often clustering at the base of the flower spathe or leaf nodes.

Common

lightbulb

How to confirm: Check the undersides of leaves and stem junctions for tiny, slow-moving insects embedded in the white residue.

build How to fix it

shopping_cart Recommended Products

1 Treat the plant with an organic insecticide spray to eliminate the mealybug infestation and remove the white waxy coating.

Bonide Captain Jack's Neem Oil 32 oz

0.9 L • 1 pcs • Organic

$10

In Stock

2 Manually remove visible insect clusters using a cotton swab dipped in isopropyl alcohol to prevent further spreading.

3 Isolate the plant from other greenery to stop the pests from migrating to healthy plants.

warning

Calcium Deficiency (Edema/Salt buildup)

In some cases, mineral deposits from hard water or physiological imbalances can manifest as a white, crusty residue on the leaf edges of Calla Lilies.

Common

lightbulb

How to confirm: Examine if the white patches are strictly localized to the leaf margins and feel crunchy rather than fuzzy.

build How to fix it

shopping_cart Recommended Products

1 Gently wipe the leaves with a damp cloth to remove the white mineral deposits and prevent further leaf edge damage.

2 Apply a calcium and magnesium supplement to help correct the physiological imbalance and strengthen cell walls.