Chrysanthemum Eder White Powder - Causes & Fixes

Jump to cause: Powdery Mildew Whitefly Infestation Mealybugs

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Powdery Mildew

This fungal disease (caused by Podosphaera xanthii or Sphaerotheca marum) is extremely common in Chrysanthemums, especially when humidity is high and air circulation is poor. It presents as a distinct white, flour-like coating on leaves and buds.

Very Common

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How to confirm: Inspect the underside of the leaves for white patches that can be rubbed off with your finger.

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shopping_cart Recommended Products

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

Bonide Captain Jack's Copper Fungicide 32 oz

0.9 L • 1 pcs • Organic

$12

In Stock

2 Prune and dispose of heavily infected leaves and buds to reduce the fungal load and improve airflow around the foliage.

Fiskars 5/8" Bypass Pruning Shears

Cutting Tools

$13

In Stock

3 Increase air circulation around the plant and avoid overhead watering to keep the foliage dry and reduce humidity levels.

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Whitefly Infestation

Small, winged insects congregate on the undersides of chrysanthemum foliage. While they don't look like 'powder,' their presence and the honeydew they secrete can lead to secondary fungal growth (sooty mold) that mimics a dusty appearance.

Common

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How to confirm: Gently shake a branch over a white piece of paper to see if tiny white insects fly out.

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shopping_cart Recommended Products

1 Apply an organic insecticide to eliminate the whitefly population and control secondary fungal growth.

Bonide Captain Jack's Neem Oil 32 oz

0.9 L • 1 pcs • Organic

$10

In Stock

2 Deploy yellow sticky traps to capture adult whiteflies and monitor the infestation levels.

Super Ninja Fungus Gnat Traps - 30 Pack

30 pcs

$7

In Stock

3 Gently wipe the undersides of the leaves with a damp cloth to remove honeydew and any visible white residue.

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Mealybugs

These sap-sucking insects are covered in a white, waxy, cottony substance that can look like white powder or spots on the stems and leaf axils of Garden Mums.

Common

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How to confirm: Use a magnifying glass to check for small, slow-moving white bumps tucked into the crevices of the stems.

build How to fix it

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 white, waxy insects.

Bonide Captain Jack's Neem Oil 32 oz

0.9 L • 1 pcs • Organic

$10

In Stock

3 Wipe away visible cottony clusters from stems and leaf axils using a cotton swab dipped in isopropyl alcohol.