White Cabbage Compass F1 White Powder - Causes & Fixes

Jump to cause: Powdery Mildew (Albugo candida) Whiteflies (Bemisia tabaci) Calcium Deficiency (Blossom End Rot/Internal Browning)

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Powdery Mildew (Albugo candida)

This is the most common cause of white patches on Brassica species like White Cabbage. The fungus manifests as white, powdery pustules that can eventually cover the leaves and affect the formation of the cabbage head.

Very Common

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How to confirm: Examine if the white spots look like a fine flour dusting and check for swollen, distorted leaf tissue.

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1 Apply an organic fungicide to the affected leaves to stop the spread of the fungal spores.

Bonide Captain Jack's Copper Fungicide 32 oz

0.9 L • 1 pcs • Organic

$12

In Stock

2 Prune and remove any heavily infected leaves immediately, ensuring you dispose of them away from your garden to prevent further contamination.

3 Improve air circulation around your cabbage plants and avoid overhead watering to keep the foliage dry and less hospitable to mildew.

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Whiteflies (Bemisia tabaci)

Small white insects cluster on the undersides of cabbage leaves. Their presence often results in a visible 'white cloud' when the plant is disturbed and can lead to sooty mold due to honeydew excretion.

Common

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How to confirm: Gently shake the plant over a white sheet to see if tiny white insects fly out from under the leaves.

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shopping_cart Recommended Products

1 Apply an organic insecticide to eliminate the whitefly population and protect the cabbage leaves.

Bonide Captain Jack's Neem Oil 32 oz

0.9 L • 1 pcs • Organic

$10

In Stock

2 Deploy yellow sticky traps near the plant to capture adult whiteflies and disrupt their breeding cycle.

Super Ninja Fungus Gnat Traps - 30 Pack

30 pcs

$7

In Stock

3 Gently wipe the undersides of the leaves to remove any visible whitefly clusters and honeydew residue.

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Calcium Deficiency (Blossom End Rot/Internal Browning)

While not a surface powder, calcium deficiency in cabbage can cause physiological breakdown of tissues that may appear as light-colored, necrotic patches on developing leaves.

Common

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How to confirm: Check if the white/pale areas are accompanied by water-soaked or necrotic tissue in the center of the plant.

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1 Apply a calcium supplement to the soil to strengthen cell walls and prevent further tissue breakdown.