Brassica Pigeon F1 Round White White Cottony Spots - Causes & Fixes

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

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Powdery Mildew

This fungal disease, caused by Oidium spp., manifests as white, flour-like patches on the leaves of Brassica crops. It thrives in high humidity and moderate temperatures, eventually causing leaves to wither and stunt growth.

Very Common

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How to confirm: Check if the white spots can be easily rubbed off with your finger and if they appear more on older leaves during humid weather.

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

Bonide Captain Jack's Copper Fungicide 32 oz

0.9 L • 1 pcs • Organic

$12

In Stock

2 Prune and remove all heavily infected leaves immediately, ensuring you dispose of them away from your garden to prevent further contamination.

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

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Mealybug Infestation

Mealybugs are small insects that secrete a white, waxy, cottony substance to protect themselves. They feed on the sap of the cabbage, often clustering in the crevices between leaf folds or near the stem.

Common

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How to confirm: Examine the underside of leaves and the base of the plant for tiny, slow-moving insects covered in white fuzz.

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1 Isolate the cabbage from other plants and spray the affected areas with an organic insecticide to kill existing mealybugs and larvae.

Bonide Captain Jack's Neem Oil 32 oz

0.9 L • 1 pcs • Organic

$10

In Stock

2 Manually remove visible white cottony clusters using a cotton swab dipped in isopropyl alcohol to prevent further spread.

3 Monitor the plant's health and use yellow sticky traps to capture any remaining flying adults or secondary pests.

Super Ninja Fungus Gnat Traps - 30 Pack

30 pcs

$7

In Stock

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Sclerotinia sclerotiorum (White Mold)

This soil-borne pathogen produces a thick, white, cottony mycelium that can envelop the cabbage head or stem. It is much more aggressive than powdery mildew and often leads to rapid tissue decay/rot.

Common

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How to confirm: Look for dark, hard, seed-like structures (sclerotia) at the base of the plant or within the white fuzzy mass.

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shopping_cart Recommended Products

1 Immediately remove and destroy all infected cabbage heads and surrounding plant debris to prevent the pathogen from spreading through the soil.

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 soil drainage and airflow around the base of the plants to reduce the humidity that promotes sclerotinia growth.