White Cabbage Sunta F1 White Cottony Spots - Causes & Fixes

Jump to cause: Powdery Mildew Mealybug Infestation Cottony Blotch (Botrytis cinerea)

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Powdery Mildew

A fungal disease caused by Oomycetes that manifests as white, flour-like patches on the leaves of brassicas. It thrives in high humidity and can inhibit photosynthesis in 'Sunta' cabbage heads.

Very Common

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How to confirm: Rub the white spots with your finger; if they smear or rub off easily like powder, it is likely powdery mildew.

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1 Apply an organic fungicide to eliminate existing fungal spores and prevent the spread to healthy 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 cabbage 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 the developing cabbage heads.

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Mealybug Infestation

Small, soft-bodied insects that secrete a white, waxy, cottony substance to protect themselves. They cluster in the crevices of cabbage leaves and suck the sap from the plant.

Common

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How to confirm: Look closely at the undersides of the leaves for tiny, slow-moving white insects or sticky residue (honeydew).

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shopping_cart Recommended Products

1 Apply an organic insecticide spray to the cabbage leaves, ensuring you target the crevices where the white cottony clusters are located to kill the insects and their eggs.

Bonide Captain Jack's Neem Oil 32 oz

0.9 L • 1 pcs • Organic

$10

In Stock

2 Manually remove visible mealybug clusters using a cotton swab dipped in isopropyl alcohol to dissolve the protective waxy coating.

3 Inspect the undersides of leaves and surrounding plant area regularly to prevent re-infestation and monitor for new larvae.

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Cottony Blotch (Botrytis cinerea)

Also known as Grey Mold, this fungus can appear as fuzzy, light-colored patches on decaying plant tissue. In high moisture environments, it spreads rapidly through cabbage foliage.

Common

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How to confirm: Check if the white spots are accompanied by soft, rotting tissue or a greyish fungal growth underneath.

build How to fix it

shopping_cart Recommended Products

1 Immediately remove and destroy all infected cabbage leaves to prevent the fungus from spreading to healthy tissue.

2 Apply an organic fungicide to protect remaining foliage and control the spread of the mold.

Bonide Captain Jack's Copper Fungicide 32 oz

0.9 L • 1 pcs • Organic

$12

In Stock

3 Improve air circulation around the plants and reduce moisture by avoiding overhead watering, especially during high humidity.