White Cabbage TCA 520 F1 White Cottony Spots - Causes & Fixes

Jump to cause: Sclerotinia sclerotiorum (White Mold) Powdery Mildew Mealybugs

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Sclerotinia sclerotiorum (White Mold)

This fungal pathogen causes rapid decay of cabbage tissue, characterized by white, cottony mycelium spreading across leaves and stems. It thrives in high humidity and cool temperatures typical for Brassica cultivation.

Very Common

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How to confirm: Inspect the base of the plant for small, hard black structures called sclerotia embedded in the white fuzz.

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1 Immediately remove and destroy all infected cabbage plants and surrounding debris to prevent the spread of fungal spores.

2 Apply an organic fungicide to the remaining healthy plants to control the spread of the white mold.

Bonide Captain Jack's Copper Fungicide 32 oz

0.9 L • 1 pcs • Organic

$12

In Stock

3 Improve air circulation and reduce humidity around the plants by spacing them further apart and avoiding overhead watering.

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Powdery Mildew

Fungal infection that presents as white, circular, powdery patches on the surface of the cabbage leaves. While less common in extremely wet conditions, it can occur during periods of high humidity and dry leaf surfaces.

Common

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How to confirm: Check if the white spots can be easily wiped off the leaf surface with your finger.

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

Bonide Captain Jack's Copper Fungicide 32 oz

0.9 L • 1 pcs • Organic

$12

In Stock

2 Prune and remove any heavily infected cabbage leaves to prevent spores from spreading to healthy parts of the plant.

3 Improve air circulation around the cabbage plants and avoid overhead watering to keep leaf surfaces dry.

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Mealybugs

Small insects that secrete a waxy, white, cottony substance to protect themselves. They feed on the sap of the cabbage, often found in the crevices of leaf axils or under the leaves.

Common

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How to confirm: Look for tiny, slow-moving insects beneath the leaves or near the stem junctions.

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1 Isolate the cabbage from other plants and spray the affected areas with an organic insecticide to eliminate the mealybug population.