Brassica oleracea Green Rich F1 White Cottony Spots - Causes & Fixes

Jump to cause: Powdery Mildew Cottony Aphid Infestation Sclerotinia sclerotiorum (White Mold)

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Powdery Mildew

This fungal disease manifests as white, flour-like patches on the leaves of Brassica oleracea. It thrives in high humidity and moderate temperatures, often spreading rapidly across the cabbage head.

Very 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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shopping_cart Recommended Products

1 Apply an organic fungicide to eliminate existing fungal spores and prevent further spread across the cabbage leaves.

Bonide Captain Jack's Copper Fungicide 32 oz

0.9 L • 1 pcs • Organic

$12

In Stock

2 Improve air circulation around the plants and reduce humidity by spacing them properly and avoiding overhead watering.

3 Remove and destroy heavily infected leaves to prevent the fungus from spreading to healthy parts of the cabbage head.

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Cottony Aphid Infestation

Certain aphid species or their secretions (honeydew) combined with Sooty Mold can create a white, fuzzy appearance. In cabbage crops, these pests cluster on the undersides of leaves and new growth.

Common

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How to confirm: Inspect the undersides of the leaves for tiny, moving insects or sticky residue.

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shopping_cart Recommended Products

1 Apply an organic insecticide to eliminate the aphid population and control the spread of the infestation.

Bonide Captain Jack's Neem Oil 32 oz

0.9 L • 1 pcs • Organic

$10

In Stock

2 Prune and dispose of heavily infested leaves to prevent the pests from migrating to new cabbage growth.

3 Monitor soil moisture levels to ensure the plant remains healthy enough to recover from the pest stress.

GROWIT Soil Moisture Meter - Blue

Water Meters

$12

In Stock

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Sclerotinia sclerotiorum (White Mold)

This soil-borne pathogen causes a white, cottony mycelium to grow around the stem and base of the cabbage plant. It can lead to rapid rotting of the inner head tissue.

Common

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How to confirm: Examine the base of the stem for firm, black, seed-like structures (sclerotia) embedded in white fuzz.

build How to fix it

shopping_cart Recommended Products

1 Remove and destroy all infected plant material and surrounding debris to prevent the spread of fungal spores.

2 Apply a fungicide to protect healthy tissue and manage existing fungal growth.

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 plant to reduce the humidity that promotes white mold.