White Cabbage Ortus F1 White Cottony Spots - Causes & Fixes

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

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Powdery Mildew

This fungal disease manifests as white, flour-like patches on the leaves of cabbage. High humidity and poor air circulation around the dense foliage of 'Ortus F1' provide ideal conditions for mycelium spread.

Very Common

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How to confirm: Inspect the underside of leaves to see if the white patches are spreading across the leaf surface like dust.

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shopping_cart Recommended Products

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

Bonide Captain Jack's Copper Fungicide 32 oz

0.9 L • 1 pcs • Organic

$12

In Stock

2 Improve air circulation around the cabbage foliage by pruning dense leaves and ensuring plants are not overcrowded.

3 Reduce humidity levels by avoiding overhead watering and ensuring the soil surface stays dry.

GROWIT Soil Moisture Meter - Teal

Water Meters

$12

In Stock

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Mealybug Infestation

Mealybugs are small insects that secrete a waxy, white, cottony substance to protect themselves. They tend to cluster in the crevices of cabbage leaves and can cause stunted growth and yellowing.

Common

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How to confirm: Look for tiny, moving white insects or sticky residue (honeydew) on the leaf undersides and stem junctions.

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shopping_cart Recommended Products

1 Isolate the cabbage plant immediately to prevent the mealybugs from spreading to other plants in your garden or home.

2 Apply an organic insecticide spray to the plant, ensuring you target the crevices of the leaves where the white cottony clusters reside.

Bonide Captain Jack's Neem Oil 32 oz

0.9 L • 1 pcs • Organic

$10

In Stock

3 Use a soft brush or cotton swab dipped in rubbing alcohol to manually remove visible mealybug clusters from the leaf joints.

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Cottony Blight (Sclerotinia)

This soil-borne pathogen can cause white, cottony fungal growth at the base of the cabbage plant or on decaying organic matter nearby. It often leads to rapid stem decay and wilting in brassicas.

Common

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How to confirm: Check the base of the cabbage stem for firm, dark sclerotia (small black structures) embedded in the white fuzz.

build How to fix it

shopping_cart Recommended Products

1 Remove and destroy all infected plant material and decaying organic matter from the area to prevent the pathogen from spreading through the soil.

2 Apply an organic fungicide to control the fungal growth and protect healthy plant tissues.

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 base of the cabbage to reduce the moisture levels that promote Sclerotinia growth.