Brassica oleracea Predeco F1 White Cottony Spots - Causes & Fixes

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Powdery Mildew (Albugo candida)

This is a common oomycete disease in Brassicas characterized by white, powdery patches on the undersides of leaves and can cause white, wart-like swellings. It thrives in high humidity and moderate temperatures.

Very Common

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How to confirm: Inspect the underside of the leaves for white, blister-like pustules or fuzzy growth.

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1 Apply an organic fungicide to the affected leaves to control the spread of the white powdery patches.

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 further spore spread.

3 Improve air circulation around your cabbage plants and avoid overhead watering to reduce the high humidity that favors Albugo candida.

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Cottony Aphid Colonies (Brevicoryne brassicae)

Cabbage aphids secrete a waxy, white substance that creates a cottony appearance around new growth and leaf axils. Large colonies can cause leaf curling and stunted growth in 'Predeco' varieties.

Very Common

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How to confirm: Gently shake a leaf over a white piece of paper to see if tiny, greenish insects drop out.

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1 Apply an organic insecticide to eliminate the aphid colonies and disrupt their life cycle.

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 spread of the waxy colonies to healthy growth.

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

GROWIT Soil Moisture Meter - Blue

Water Meters

$12

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Sclerotinia Sclerotiorum (White Mold)

This fungal pathogen produces dense, white cottony mycelium that can envelop cabbage heads and leaves. It often leads to rapid tissue decay and the formation of hard, black sclerotia.

Common

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How to confirm: Check if the white patches are accompanied by soft, water-soaked tissue or dark rot.

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

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 air circulation and reduce moisture by spacing plants properly and avoiding overhead watering.

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Mealybugs

While less common in temperate cabbage crops than aphids, mealybugs produce a white, waxy/cottony coating to protect themselves. They suck sap from the plant, causing yellowing of the leaves.

Common

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How to confirm: Look for small, oval-shaped insects hidden deep within the leaf crevices or base of the stem.

build How to fix it

shopping_cart Recommended Products

1 Apply an organic insecticide spray to eliminate the mealybug population and remove the white 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 depletion.

3 Monitor soil moisture levels to ensure the plant is not under environmental stress, which can make it more susceptible to pests.