Kalanchoe serrata White Powder - Causes & Fixes

Jump to cause: Powdery Mildew Mealybugs Calcium Deficiency

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Powdery Mildew

This fungal disease thrives in high humidity and poor air circulation around the serrated leaves of Kalanchoe. It manifests as a distinct white, flour-like coating on the leaf surfaces.

Very Common

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How to confirm: Check if the white spots can be wiped off with your finger, leaving a lesion underneath.

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

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 avoiding overhead watering and ensuring the leaves are dry.

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

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 plant's stems and leaves. Infestations often occur in the crevices of the serrated leaf edges.

Very Common

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How to confirm: Inspect the undersides of leaves and stem junctions for small, moving white insects or sticky residue.

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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 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 Use a cotton swab dipped in isopropyl alcohol to manually remove visible white cottony clusters from the leaf crevices.

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Calcium Deficiency

In succulents like Kalanchoe serrata, extreme nutrient imbalances can cause physiological spotting or 'scab' which may appear as whitish, dry patches on newer growth.

Common

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How to confirm: Observe if the white patches are localized specifically to the newest, youngest leaves at the top of the plant.

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1 Apply a calcium supplement to the soil to correct the nutrient imbalance and strengthen cell walls.

FoxFarm Bush Doctor Cal Mag Liquid Supplement 1 Pint

0.5 L • 1 pcs • Organic

$22

In Stock

2 Monitor the soil moisture levels closely using a moisture meter to ensure the plant is not experiencing water stress, which can exacerbate nutrient uptake issues.