White Cabbage Ippon F1 White Cottony Spots - Causes & Fixes

Jump to cause: Powdery Mildew (Albugo candida) Cottony Blight (Sclerotinia sclerotiorum) Mealybug Infestation

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Powdery Mildew (Albugo candida)

This is a common fungal-like oomycete in brassicas that manifests as white, fuzzy patches on the leaf surfaces. It thrives in high humidity and can cause the cabbage leaves to become distorted or necrotic.

Very Common

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How to confirm: Inspect the underside of the leaves for white spore masses and check if the spots expand rapidly across the leaf surface.

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1 Apply an organic fungicide to the affected leaves to stop the spread of the fungal-like pathogen.

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 reduce overhead watering to lower humidity levels around the foliage.

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Cottony Blight (Sclerotinia sclerotiorum)

This pathogen produces a distinct white, cotton-like mycelium that can envelop the cabbage head or leaves. It often leads to stem rot and rapid tissue collapse in high-moisture environments.

Common

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How to confirm: Look for firm, dark sclerotia (small black structures) embedded within the white fuzzy mass on the stem or leaf base.

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shopping_cart Recommended Products

1 Immediately remove and destroy all infected cabbage heads and surrounding plant debris to prevent the pathogen from spreading through the soil.

2 Apply an organic fungicide to protect healthy tissue and manage the spread of the mycelium.

Bonide Captain Jack's Copper Fungicide 32 oz

0.9 L • 1 pcs • Organic

$12

In Stock

3 Reduce moisture levels by improving soil drainage and avoiding overhead watering, as high humidity promotes blight.

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Mealybug Infestation

Mealybugs are small insects that secrete a white, waxy, cottony substance to protect themselves. They feed on the sap of the cabbage, often causing yellowing and stunted growth in the 'Ippon' cultivar.

Common

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How to confirm: Use a magnifying glass to check for tiny, slow-moving insects tucked into the crevices of the leaf axils or the base of the head.

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shopping_cart Recommended Products

1 Apply an organic insecticide to eliminate existing mealybug adults, larvae, and eggs on the cabbage leaves and stems.