White Cabbage Strukt F1 White Cottony Spots - Causes & Fixes

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

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Powdery Mildew

This fungal disease manifests as white, flour-like patches on the leaves of cabbage. It thrives in high humidity and moderate temperatures, eventually causing leaves to yellow and distort.

Very Common

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How to confirm: Inspect the undersides of leaves for fuzzy white growth that cannot be easily wiped off without damaging the leaf tissue.

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1 Apply an organic fungicide to the affected leaves to eliminate the powdery mildew fungus and prevent further spread.

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 spore dispersal.

3 Improve air circulation around your cabbage plants and avoid overhead watering to reduce the high humidity that promotes fungal growth.

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Mealybugs

These small insects secrete a white, waxy, cottony substance to protect themselves as they feed on the cabbage sap. Infestations often lead to stunted growth and leaf yellowing.

Common

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How to confirm: Look for tiny, moving insects hidden in the crevices of the leaf axils or underneath the leaves.

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shopping_cart Recommended Products

1 Apply an organic insecticide spray to the affected areas to eliminate the mealybug population and destroy their protective waxy coating.

Bonide Captain Jack's Neem Oil 32 oz

0.9 L • 1 pcs • Organic

$10

In Stock

2 Manually remove visible insect clusters using a cotton swab dipped in isopropyl alcohol to prevent further sap feeding and stunted growth.

3 Inspect the undersides of leaves and stem junctions regularly to catch new infestations before they spread to the rest of the cabbage.

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Sclerotinia (White Mold)

This soil-borne pathogen causes white, cottony mycelium to appear at the base of the cabbage plant or on stem tissues. It can lead to rapid rotting of the core.

Common

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How to confirm: Check if the white growth is concentrated around the stem or crown and look for small, dark, seed-like sclerotia in the soil.

build How to fix it

shopping_cart Recommended Products

1 Remove and destroy all infected plant tissue and debris immediately to prevent the fungus from spreading through the soil.

2 Apply an organic fungicide to the base of the plant and surrounding soil to control the spread of the mycelium.

Bonide Captain Jack's Copper Fungicide 32 oz

0.9 L • 1 pcs • Organic

$12

In Stock

3 Improve soil drainage and airflow around the cabbage base to create an environment less hospitable to white mold.